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The cost of the Nivelle Offensive in casualties and loss of morale were great but German losses were also high and the tactical success of the offensive in capturing elaborately fortified positions and defeating counter-attacks, reduced German morale. The German had been forced from three of the strongest positions on the Western Front and had failed to recapture them. Vimy Ridge, the Scarpe Heights, the caverns, spurs and plateau of the Chemin des Dames and the Moronvilliers massif had been occupied for more than two years, carefully surveyed by German engineers and fortified to make them impregnable. In six weeks all were lost and the Germans were left clinging to the eastern or northern edges of the ridges of the summits, having lost the western or southern sides.　The French tactic of assault brutal et continu suited the German defensive dispositions, since much of the new construction had taken place on reverse slopes. The speed of attack and the depth of the French objectives meant that there was no time to establish artillery observation posts overlooking the Ailette valley, in the areas where French infantry had reached the ridge. The tunnels and caves under the ridge nullified the destructive effect of the French artillery, which was also inhibited by poor weather, which reduced observation and by German air superiority, which made French artillery-observation aircraft even less effective.

From spring 1916, the British had deployed five tunnelling companies along the Vimy Ridge and during the first two months of their tenure of the area, 70 mines were fired, mostly by the Germans. Between October 1915 and April 1917 an estimated 150 French, British and German charges were fired in this 7 kilometres (4.3 mi) sector of the Western Front. In May 1916, Operation Schleswig-Holstein, a German infantry attack, forced the British back 640 metres (700 yd), to stop British mining by capturing the shaft entrances. From June 1916, the Germans withdrew many miners to work in coal mines in Germany. In the second half of 1916, the British constructed strong defensive underground positions and from August 1916, the Royal Engineers developed a mining scheme for a big infantry attack on the Vimy Ridge proposed for autumn 1916, although this was postponed. After September 1916, when the Royal Engineers had completed their network of defensive galleries along most of the front line, offensive mining largely ceased although activities continued until 1917. The British gallery network beneath Vimy Ridge eventually grew to a length of 12 kilometres (7.5 mi). The Canadian Corps was posted to the northern part of Vimy Ridge in October 1916 and preparations for an attack were revived in February 1917. British tunnelling companies created extensive underground networks and fortifications.

Twelve subways, up to 1.2 kilometres (0.75 mi) long were excavated at a depth of 10 metres (33 ft) and used to connect reserve lines to front lines, permitting soldiers to advance to the front quickly, securely and unseen. Often incorporated into subways were light rail lines, hospitals, command posts, water reservoirs, ammunition stores, mortar and machine gun posts and communication centres. The Germans dug a number of similar tunnels on the Vimy front, to provide covered routes to the front line and protection for headquarters, resting personnel, equipment and ammunition.The Germans also conducted counter-mining against the British tunnellers and destroyed a number of British attempts to plant mines under or near their lines. Prior to the Battle of Vimy Ridge, the British tunnelling companies also secretly laid 13 mines under German positions to destroy surface fortifications before the assault. To protect some advancing troops from German machine-gun fire, as they crossed no man's land during the attack, eight smaller Wombat charges were laid at the end of the subways, to allow troops to move more quickly and safely enter the German trench system, by creating an elongated trench-depth crater that spanned the length of no man's land. At the same time, 19 crater groups existed along this section of the Western Front, each with several large craters.

Allgemeines über Stellungsbau (Principles of Field Fortification) was published in January 1917 and by April an outpost zone (Vorpostenfeld) held by sentries, had been built along the Western Front. Sentries could retreat to larger positions (Gruppennester) held by Stosstrupps (five men and an NCO per Trupp), who would join the sentries to recapture sentry-posts by immediate counter-attack. Defensive procedures in the battle zone were similar but with greater numbers. The front trench system was the sentry line for the battle zone garrison, which was allowed to move away from concentrations of enemy fire and then counter-attack to recover the battle and outpost zones; such withdrawals were envisaged as occurring on small parts of the battlefield which had been made untenable by Allied artillery fire, as the prelude to Gegenstoss in der Stellung (immediate counter-attack within the position). Such a decentralised battle by large numbers of small infantry detachments would present the attacker with unforeseen obstructions. Resistance from troops equipped with automatic weapons, supported by observed artillery fire, would increase the further the advance progressed. A school was opened in January 1917 to teach infantry commanders the new methods.

The Battle of Pilckem Ridge, 31 July – 2 August 1917, was the opening attack of the Third Battle of Ypres in the First World War. The British Fifth Army, Second Army and the French First Army on the northern flank, attacked the German 4th Army which defended the Western Front from Lille, to the Ypres Salient in Belgium and on to the North Sea coast. On 31 July, the Anglo-French armies captured Pilckem (Flemish: Pilkem) Ridge and areas either side, the French attack being a great success. After several weeks of changeable weather, heavy rain fell during the afternoon of 31 July. British observers in the XIX Corps area in the centre, lost sight of the troops that had advanced to the main objective at the green line and three reserve brigades pressing on towards the red line. The weather changed just as German regiments from specialist counter-attack Eingreif divisions intervened. The reserve brigades were forced back through the green line to the intermediate black line, which the British artillery-observers could still see and the German counter-attack was stopped by massed artillery and small-arms fire. The attack had mixed results; a substantial amount of ground was captured by the British and French, except on the Gheluvelt Plateau on the right flank, where only the blue line (first objective) and part of the black line (second objective) were captured. A large number of casualties were inflicted on the German defenders, 5,626 German prisoners were taken and the German Eingreif divisions managed to recapture some ground from the Ypres–Roulers railway, northwards to St. Julien. For the next few days, both sides made local attacks to improve their positions, much hampered by the wet weather. The rains had a serious effect on operations in August, causing more problems for the British and French, who were advancing into the area devastated by artillery fire and partly flooded by the unseasonable rain. A local British attack on the Gheluvelt Plateau was postponed because of the weather until 10 August and the second big general attack due on 4 August, could not begin until 16 August. Pilckem Ridge　ピルケム高地

As the infantry advanced over the far edge of the ridge, German artillery and machine-guns east of the ridge began to fire and the British artillery was less able to suppress them. Fighting continued on the lower slopes on the east side of the ridge until 14 June. The offensive removed the Germans from the dominating ground on the southern face of the Ypres salient, which the 4th Army had held since the First Battle of Ypres (19 October – 22 November 1914). The Russian army launched the Kerensky Offensive to honour the agreement struck with its allies, at the Chantilly meeting of 15–16 November 1916. After a brief period of success from 1–19 July, the German strategic reserve of six divisions, captured Riga from 1–5 September 1917. In Operation Albion (September–October 1917), the Germans took the islands at the mouth of the Gulf of Riga and the British and French commanders on the Western Front, had to reckon on the German western army (Westheer) being strengthened by reinforcements from the Eastern Front, in late 1917. Haig wished to exploit the diversion of German forces in Russia for as long as it continued and urged that the maximum amount of manpower and munitions be committed to the battle in Flanders. Haig selected Gough to command the offensive on 30 April and on 10 June, Gough took over the Ypres salient north of Messines Ridge. Gough planned an offensive based on the GHQ 1917 plan and the instructions he had received from Haig. On the understanding that Haig wanted a more ambitious version, Gough held meetings with his corps commanders on 6 and 16 June, where the third objective, which included the Wilhelm Stellung (third line), a second-day objective in earlier plans, was added to the two objectives due to be taken on the first day. A fourth objective was also given for the first day but was only to be attempted at the discretion of divisional and corps commanders, in places where the German defence had collapsed.

The shorter intervals between attacks since then had several effects, allowing less time for either side to prepare and the Germans had to take more risks on the rest of the Western Front, to replace tired and depleted divisions in Flanders. German troops and ammunition trains overloaded the rail network in west Flanders, while more German artillery escaped British counter-battery fire and less time was available for wire cutting and pillbox destruction, although the Germans generally left these to give battle in the open. The British artillery preparation before Polygon Wood on 26 September, began 24 hours before the infantry attack. No formal artillery preparation was conducted before 4 October, except for the normal heavy artillery counter-battery fire and destructive fire on German strong-points. To mislead the Germans as to the date and time of the infantry attack, when a hurricane bombardment was to be fired at zero hour, "practice" barrages were begun on 27 September and increased to two barrages a day from 1 October. Despite the ruse of using practice barrages, "a very reliable agent" informed the Germans that an attack was coming from as early as 1 October. The battle was almost called off when heavy rain began again on 2 October, turning parts of the ground into a morass. British military intelligence predicted the German defensive changes after the defeats of 20 and 26 September, in an intelligence summary of 1 October which led to the British being ready for Unternehmen Hohensturm (Operation High Storm), a big German counter-attack to recapture the area around Zonnebeke on 4 October. The attack aimed to complete the capture of the Gheluvelt Plateau by the occupation of Broodseinde Ridge and Gravenstafel Spur. This would protect the southern flank of the British line and permit attacks on Passchendaele Ridge to the north-east. The attack was planned for 6 October, to give the II Anzac Corps time to prepare. Haig was anxious about the possibility of deteriorating weather and on 26 September, was able to order the date to be advanced by two days, because of the quick relief of V Corps by the II Anzac Corps north of the Ypres–Roulers railway.

The Battle of Langemarck from 16–18 August 1917, was the second Allied general attack of the Third Battle of Ypres, during the First World War. The battle took place near Ypres in Belgian Flanders, on the Western Front against the German 4th Army. The French France had a big success on the northern flank and the main British gain of ground occurred near Langemark, adjacent to the French. The Allied attack succeeded from Langemarck to Drie Grachten (Three Canals) but early advances in the south on the Gheluvelt Plateau, were forced back by powerful German counter-attacks. Both sides were hampered by rain, which had a greater effect on the British and French, who occupied lower-lying areas and advanced onto ground which had been frequently and severely bombarded. The effect of the battle, the unseasonable August downpours and the successful but costly German defence of the Gheluvelt Plateau during the rest of August, which the British attacked several times, led the British to stop the offensive for three weeks. The ground dried in early September, as the British rebuilt roads and tracks for supply, transferred more artillery from the armies further south and revised further their tactics. The British shifted the main offensive effort southwards, which led to the three big British successes on the Gheluvelt Plateau on 20, 26 September and 4 October. Strategic background See also: Battle of Hill 70 Artillery preparation for the Second Battle of Verdun, in support of the Allied offensive in Flanders, which had been delayed from mid-July, began on an 11 mi (18 km) front on 20 August after an eight-day bombardment. Mort Homme and Hill 304 were recaptured and 10,000 prisoners taken. The German army was not able to counter-attack the French, because the Eingreif divisions had been sent to Flanders. Fighting at Verdun continued into September, adding to the pressure on the German army. The Battle of Hill 70 (15–25 August), on the outskirts of Lens on the British First Army front, was fought by the Canadian Corps. Langemarck : ランゲマルク

These guns were supplied with 500 rounds per 60-pdr and 6-inch howitzers, 400 rounds per 8-inch howitzer, 600 rounds per 4.5-inch howitzer, and 600 rounds per 18-pdr. Divisional commanders controlled the use of their divisional artilleries, excepting three brigades of 18-pdrs. The 263rd Brigade, 52nd (Lowland) Division was attached to 54th (East Anglian) Division until 07:30 when it transferred to the 74th (Yeomanry) Division with the objective of defending the Sheikh Abbas Ridge. The 267th Brigade, 53rd (Welsh) Division was attached to the 52nd (Lowland) Division until 07:30 when it returned to the 53rd (Welsh) Division. The 272nd Brigade, 54th (East Anglian) Division was attached to Eastern Force artillery until 18:30 18 April when it came under orders of 74th (Yeomanry) Division. The available guns had been deployed at a ratio of one gun every 100 yards (91 m), compared with one gun every 36 feet (11 m) at Arras, on the Western Front, in April 1917. There were not enough guns to cover the 15,000 yards (14,000 m) front. The light field guns could not produce a sufficiently dense bombardment, and the thin barrage was not effectively strengthened by the naval guns. It quickly became clear that the gunfire from the warships, heavy artillery, and field howitzers, including the gas shells, had not silenced the defenders' artillery. Ten minutes before the infantry attack, 18-pdrs began their covering fire.

And Dobell wrote, This action has had the result of bringing the enemy to battle, and he will now undoubtedly stand with all his available force in order to fight us when we are prepared to attack. It has also given our troops an opportunity of displaying the splendid fighting qualities they possess. So far as all ranks of the troops engaged were concerned, it was a brilliant victory, and had the early part of the day been normal victory would have been secured. Two more hours of daylight would have sufficed to finish the work the troops so magnificently executed after a period of severe hardship and long marches, and in the face of most stubborn resistance. — General Dobell, Eastern Force The British press reported the battle as a success, but an Ottoman plane dropped a message that said, "You beat us at communiqués, but we beat you at Gaza."Dallas, the commander of the 53rd (Welsh) Division, resigned after the battle, owing to a "breakdown in health." Judged by Western Front standards, the defeat was small and not very costly. Murray's offensive power had not been greatly affected and preparations for a renewal of the offensive were quickly begun. The Second Battle of Gaza began on 17 April 1917.

The Arras sector then returned to the stalemate that typified most of the war on the Western Front, except for attacks around Lens, culminating in the Canadian Battle of Hill 70 in August.At the beginning of 1917, the British and French were still searching for a way to achieve a strategic breakthrough on the Western Front. The previous year had been marked by the costly success of the Franco–British offensive astride the river Somme, while the French had been unable to take the initiative because of intense German pressure at Verdun until after August 1916. Both battles consumed enormous quantities of resources while achieving virtually no strategic gains on the battlefield. Nonetheless, the cost to Germany of containing the Anglo-French attacks had been high, and given that the material preponderance of the Entente and its allies could only be expected to increase in 1917, Hindenburg and Ludendorff decided on a defensive strategy on the Western Front for that year. This impasse reinforced the French and British commanders' belief that to end the stalemate they needed a breakthrough; while this desire may have been the main impetus behind the offensive, the timing and location were heavily influenced by a number of political and tactical factors.

It was agreed in the London Convention of 16 January, that the French assault on the Aisne would begin in mid-April and that the British would make a diversionary attack in the Arras sector approximately one week prior. Three armies of Field Marshal Sir Douglas Haig, the commander of the British Expeditionary Force (BEF) were in the Arras sector, the Fifth Army (General Hubert Gough) in the south, the Third Army (General Edmund Allenby) in the centre and the First Army (General Henry Horne) in the north and the plan was devised by Allenby. In December 1916, the training manual SS 135 replaced SS 109 of 8 May 1916 and marked a significant step in the evolution of the British Expeditionary Force (BEF) into a homogeneous force, well adapted to its role on the Western Front. The duties of army, corps and divisions in planning attacks were standardised. Armies were to devise the plan and the principles of the artillery component. Corps were to allot tasks to divisions, which would then select objectives and devise infantry plans subject to corps approval.

By the end of the Third Battle of Ypres in November 1917, the effectiveness of the methods of defence introduced in 1917 had been eroded and continuation of a defensive strategy in the west was made impossible. The defeat of Russia gave the German leadership a final opportunity to avoid defeat, rather than the attempts to compete with Allied numerical and industrial superiority, through economic warfare in the Atlantic and the domestic initiatives of the Hindenburg Programme, the Auxiliary Service Law and temporary demobilisation of skilled workers from the army. The accuracy of Great War casualty statistics is disputed. Casualty data available refer to Western Front totals as shown in Winston Churchill's The World Crisis (1923–29) and do not refer directly to the German withdrawal to the Hindenburg Line (Siegfriedstellung) or losses which would be considered "normal wastage", occurring as a consequence of the existence of the Western Front, rather than to particular military operations.

In February, General Yudenich was praised for the victory and promoted to commander-in-chief of all Russian troops in the Caucasus. The Allies (British and France) asked Russia to relieve the pressure on the Western front. In return, Russia asked the Allies to relieve pressure in the Caucasus by a naval attack. The resulting operations in the Black Sea gave the Russians some respite to replenish their forces. Additionally, actions at the Battle of Gallipoli which aimed at capturing the Ottoman capital helped the Russian forces on this front. On February 12, the commander of the 3rd Army Hafiz Hakki Pasha died of typhus and was replaced by Brigadier General Mahmut Kamil Pasha. Kamil faced the daunting task of putting the Ottoman army back in order. The military planners back in Istanbul were scared of the Russians advancing deeper into the mainland. During March the strategic situation remained stable. The completely devastated 3rd Army received new blood through reinforcements from the 1st and 2nd Armies, although these supplements were not stronger than a division. The Battle of Gallipoli was draining every Ottoman resource. Meanwhile, the Russians were holding the towns of Eleşkirt, Ağrı and Doğubeyazıt in the south. Military action never escalated above small-scale skirmishes—the Ottomans simply did not have enough forces to secure the whole East Anatolian region.

On 19 August the Fifth Army began to move into the angle of the Meuse and Sambre rivers close to Namur, which required a march of up to 100 kilometres (62 mi) and took the army far beyond the left flank of the Fourth Army. Opposite the French were the 2nd and 3rd armies, with 18 divisions against the 15 French divisions. The I Corps held the west bank of the Meuse from Givet to Namur, X Corps faced north-west along the Sambre, with the III Corps to the west opposite Charleroi and the XVIII Corps further to the left. French cavalry on the left flank skirmished with German cavalry on 20 August and next day Joffre ordered the Fifth Army to advance, with the BEF on the left to find and attack the German forces west of the Meuse.

The First Battle of Champagne (French: 1ère Bataille de Champagne) was fought from 20 December 1914 – 17 March 1915 in World War I in the Champagne region of France and was the second offensive by the Allies against the Germans since mobile warfare had ended after the First Battle of Ypres in Flanders (19 October – 22 November 1914). The battle was fought by the French Fourth Army and the German 3rd Army. The offensive was part of a strategy by the French army to attack the Noyon Salient, a large bulge in the new Western Front, which ran from Switzerland to the North Sea. The First Battle of Artois began on the northern flank of the salient on 17 December and the offensive against the southern flank in Champagne began three days later. By early November, the German offensive in Flanders had ended and the French began to consider large offensive operations. Attacks by the French would assist the Russian army and force the Germans to keep more forces in the west. After studying the possibilities for an offensive, the Operations Bureau of Grand Quartier Général (GQG: the French army headquarters) reported on 15 November. The Bureau recommended to General Joseph Joffre a dual offensive, with attacks in Artois and Champagne, to crush the Noyon salient. The report noted that the German offensive in the west was over and four to six corps were being moved to the Eastern Front. Despite shortages of equipment, artillery and ammunition, which led Joffre to doubt that a decisive success could be obtained, it was impossible to allow the Germans freely to concentrate their forces against Russia. Principal attacks were to be made in Artois by the Tenth Army towards Cambrai and by the Fourth Army (General Fernand de Langle de Cary) in Champagne, from Suippes towards Rethel and Mézières, with supporting attacks elsewhere. The objectives were to deny the Germans an opportunity to move troops and to break through in several places, to force the Germans to retreat. After minor skirmishes, the battle began on 20 December 1914 when the XVII and I Colonial Corps attacked and made small gains. On 21 December, the XII Corps failed to advance, because most gaps in the German barbed wire were found to be covered by machine-guns. The attack by XII Corps was stopped and the infantry began mining operations, as the artillery bombarded German defences. After several days of attacks, which obtained more small pieces of territory, the main effort was moved by de Cary to the centre near Perthes and a division was added between XVII Corps and I Colonial Corps. On 27 December, Joffre, sent the IV Corps to the Fourth Army area, which made it possible for de Langle to add another I Corps division to the front line. First Battle of Champagne 第一次シャンパーニュ会戦

From 17 September – 17 October 1914, the belligerents had made reciprocal attempts to turn the northern flank of their opponent. Joffre ordered the French Second Army to move to the north of the French Sixth Army, by moving from eastern France from 2–9 September and Falkenhayn ordered the German 6th Army to move from the German-French border to the northern flank on 17 September. By the next day French attacks north of the Aisne, led to Falkenhayn ordering the 6th Army to repulse French forces to secure the flank. When the French Second Army advanced, it met a German attack rather than an open flank on 24 September and by 29 September, the Second Army had been reinforced to eight corps but was still opposed by German forces near Lille, rather than advancing around the German northern flank. The German 6th Army had also found that on arrival in the north, that it was forced to oppose the French attack, rather than advance around the flank; the secondary objective of protecting the northern flank of the German armies in France had become the main task. By 6 October, the French needed British reinforcements to withstand German attacks around Lille. The BEF had begun to move from the Aisne to Flanders on 5 October and with reinforcements from England, assembled on the left flank of the Tenth Army, which had been formed from the left flank units of the Second Army on 4 October. In October 1914 French and British artillery commanders met to discuss means for supporting infantry attacks, the British practice having been to keep the artillery silent until targets were identified, the French artillery fired a rafale, which ceased as the infantry began the assault. A moving barrage of fire was proposed as a combination of both methods and became a standard practice, when guns and ammunition were accumulated in sufficient quantity. Falkenhayn issued memoranda on 7 and 25 January 1915, defining a model of defensive warfare to be used on the Western Front, to enable ground to be held with the fewest possible troops. By reducing demand for manpower in the west, a larger number of divisions could be sent to the Eastern Front. The front line was to be fortified, to enable its defence with small numbers of troops indefinitely; areas captured were to be recovered by counter-attacks. A second trench was to be dug behind the front line, to shelter the trench garrison and to have easy access to the front line, through covered communication trenches. Should counter-attacks fail to recover the front trench, a rearward line was to be connected to the remaining parts of the front line, limiting the loss of ground to a bend (Ausbeulung) in the line, rather than a breakthrough. The building of the new defences took until the autumn of 1915 and confronted Franco-British offensives with an evolving system of field fortifications, which was able to absorb the increasing power and sophistication of attempted breakthrough attacks.

The logistical prelude to the Meuse attack was planned by then-Colonel George Marshall who managed to move American units to the front after the Battle of Saint-Mihiel. The big September/October Allied breakthroughs (north, centre and south) across the length of the Hindenburg Line – including the Battle of the Argonne Forest – are now lumped together as part of what is generally remembered as the Grand Offensive (also known as the Hundred Days Offensive) by the Allies on the Western Front. The Meuse-Argonne offensive also involved troops from France, while the rest of the Allies, including France, Britain and its dominion and imperial armies (mainly Canada, Australia and New Zealand), and Belgium contributed to major battles in other sectors across the whole front. The French and British armies' ability to fight unbroken over the whole four years of the war, in what amounted to a bloody stalemate, is credited by some historians with breaking the spirit of the German Army on the Western Front, a view which ignores the German Spring_Offensive of 1918. The Grand Offensive, including British, French and Belgian advances in the north along with the French-American advances around the Argonne forest, is in turn credited for leading directly to the Armistice of November 11, 1918. On September 26, the Americans began their strike north towards Sedan. The next day British and Belgian divisions drove towards Ghent (Belgium). British and French armies attacked across northern France on September 28. The scale of the overall offensive, bolstered by the fresh and eager, but largely untried and inexperienced, U.S. troops, signaled renewed vigor among the Allies and sharply dimmed German hopes for victory. The Meuse-Argonne offensive, shared by the U.S. forces with the French Fourth Army on the left, was the biggest operation and victory of the American Expeditionary Forces (AEF) in World War I. The bulk of the AEF had not gone into action until 1918. The Meuse-Argonne battle was the largest frontline commitment of troops by the U.S. Army in World War I, and also its deadliest. Command was coordinated, with some U.S. troops (e.g. the Buffalo Soldiers of the 92nd Division and the 93rd Division) attached and serving under French command (e.g. XVII Corps during the second phase). The main U.S. effort of the Meuse-Argonne offensive took place in the Verdun Sector, immediately north and northwest of the town of Verdun, between September 26 and November 11, 1918.

The First, led by General Liggett, would continue to move to the Carignan-Sedan-Mezieres Railroad. The Second Army, led by Lieutenant General Robert L. Bullard, was directed to move eastward towards Metz. The two U.S. armies faced portions of 31 German divisions during this phase. The American troops captured German defenses at Buzancy, allowing French troops to cross the River Aisne, whence they rushed forward, capturing Le Chesne (the Battle of Chesne (French: Bataille du Chesne)). In the final days, the French forces conquered the immediate objective, Sedan and its critical railroad hub (the Advance to the Meuse (French: Poussée vers la Meuse)), on November 6 and American forces captured surrounding hills. On November 11, news of the German armistice put a sudden end to the fighting. The Battle of Canal du Nord was part of the Hundred Days Offensive of the First World War by the Allies against German positions on the Western Front. The battle took place in the Nord-Pas-de-Calais region of France, along an incomplete portion of the Canal du Nord and on the outskirts of Cambrai between 27 September and 1 October 1918. To prevent the Germans from sending reinforcements against one attack, the assault along the Canal du Nord was part of a sequence of Allied attacks at along the Western Front. The attack began the day after the Meuse-Argonne Offensive commenced, a day before an offensive in Belgian Flanders and two days before the Battle of St. Quentin Canal. The attack took place along the boundary between the British First Army and Third Army, which were to continue the advance started with the Battle of the Drocourt-Quéant Line, Battle of Havrincourt and Battle of Epehy. The First Army was to lead the crossing of the Canal du Nord and secure the northern flank of the British Third Army as both armies advanced towards Cambrai. The Third Army was also to capture the Escaut (Scheldt) Canal, to support the Fourth Army during the Battle of St. Quentin Canal. Construction of the Canal du Nord began in 1913 to link the Oise River to the Dunkirk–Scheldt Canal. When the First World War began, work stopped with the canal in varying stages of completion. During their retreat, the Germans made the area along the canal north of Sains-lès-Marquion virtually impassable, to dam and flood the naturally swampy ground. The only passable ground was to the south, where a small 4,000 yd (2.3 mi; 3.7 km) section of the canal between Sains-lès-Marquion and Mœuvres remained largely dry, on account of its incomplete state. Canal du Nord カナル・デュ・ノール

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