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At the Battle of Mons the BEF had some 80,000 men, comprising the Cavalry Division, an independent cavalry brigade and two corps, each with two infantry divisions. I Corps was commanded by Sir Douglas Haig and was composed of the 1st and 2nd Divisions. II Corps was commanded by Sir Horace Smith-Dorrien and consisted of the 3rd and 5th Divisions. Each division had 18,073 men and 5,592 horses, in three brigades of four battalions. Each division had twenty-four Vickers machine guns – two per battalion – and three field artillery brigades with fifty-four 18-pounder guns, one field howitzer brigade of eighteen 4.5-inch howitzers and a heavy artillery battery of four 60-pounder guns.

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Each German regiment held a zone approximately 1,000 metres (1,100 yd) wide as far back as the rear area. When the Canadian Corps attacked, each German company faced two or more battalions of approximately 1,000 men each. Reserve divisions were kept approximately 24 kilometres (15 mi) back instead of assembling close behind the second line according the defence-in-depth theory. The Canadian Corps' divisional artillery formations, totalling eight field brigades and two heavy artillery groups, were insufficient for the task at hand and were consequently reinforced with outside formations. Four heavy artillery groups, nine artillery field brigades, three divisional artillery groups and the artillery complement of the British 5th Division was attached to the Canadian Corps. In addition, ten heavy artillery groups of the flanking I and XVII Corps were assigned tasks in support of the Canadian Corps. The artillery batteries of I Corps were particularly important because they enfiladed German gun positions behind Vimy Ridge. In total, the British made available to the Canadian Corps twenty-four brigade artillery groups consisting of four hundred and eighty 18 pounder field guns, one hundred thirty-eight 4.5 inch howitzers, ninety-six 2 inch trench mortars, twenty-four 9.45 inch mortars, supported by 245 corps-level siege guns and heavy mortars.

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The QF 4.5-inch howitzer was to be used for neutralising German artillery with gas shells, bombarding weaker defences, blocking communication trenches, night barrages and wire-cutting on ground where field guns could not reach. The BL 60 pounder gun was to be used for longer-range barrages and counter-battery fire, the 6-inch Gun for counter-battery fire, neutralisation-fire and wire-cutting using fuze 106. The larger howitzers were reserved for counter-battery fire against well-protected German artillery and the larger guns for long-range fire against targets like road junctions, bridges and headquarters. Co-ordination of artillery was improved by using more telephone exchanges, which put artillery observers in touch with more batteries. Observing stations were built to report to artillery headquarters located at corps headquarters, on the progress of infantry and a corps signals officer was appointed to oversee artillery communication, which had become much more elaborate.

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The introduction of the instantaneous No. 106 fuze greatly improved the effectiveness of the artillery since this fuse burst reliably with the slightest of contact, unlike older timed fuses, making it especially effective at cutting barbed wire before the advance. To maintain communications during the battle, particularly with the artillery, field units laid over 1,400 kilometres (870 mi) of telegraph and field telephone cabling, normally at a depth of 2.1 metres (7 ft). In addition, the corps conducted coordinated counter-battery initiatives before the battle. The First Army Field Survey Company printed barrage maps for all batteries, produced artillery boards and provided counter-battery support with their flash spotting groups and sound ranging sections. Utilizing flash spotting, sound ranging and aerial reconnaissance from No. 16 Squadron, and No. 1 & 2 Balloon Company of the Royal Flying Corps in the week before the battle, the counter battery artillery under command of Lieutenant-Colonel Andrew McNaughton fired 125,900 shells, harassing an estimated 83% of the German gun positions. In February 1917, the British General Staff released a training pamphlet titled SS 143 Instructions for the Training of Platoons for Offensive Action, espousing the return to the pre-war emphasis on fire and movement tactics and the use of the platoon as a self-contained tactical unit.

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Artillery planning was controlled by corps with consultation of divisions by the corps General Officer Commanding, Royal Artillery (GOCRA) which became the title of the officer at each level of command who devised the bombardment plan, which was coordinated with neighbouring corps artillery commanders by the army GOCRA. Specific parts of the bombardment were nominated by divisions, using their local knowledge and the results of air reconnaissance. The corps artillery commander was to co-ordinate counter-battery fire and the howitzer bombardment for zero hour. Corps controlled the creeping barrage but divisions were given authority over extra batteries added to the barrage, which could be switched to other targets by the divisional commander and brigade commanders. SS 135 provided the basis for the BEF's operational technique for the rest of 1917. The training manual SS 143 of February 1917 marked the end of attacks made by lines of infantry with a few detached specialists.

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With the ground still frozen, assembly trenches could not be dug, so it was decided that the troops would assemble in the open for the attack. The artillery of II Corps began a destructive and wire-cutting bombardment on 14 February, using the new fuze 106 against the German wire, which proved an effective wire-cutter, although fog and mist made aiming and observation of the results difficult. At zero hour, four siege groups were to begin a bombardment of rear lines and machine-gun nests and four counter-battery groups were to neutralise German artillery within range of the attack. Artillery tactics were based on the experience of 1916, with a creeping barrage fired by half of the 18-pounders, beginning 200 yards (180 m) in front of the infantry and moving at 100 yards (91 m) in three minutes.

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Surplus field artillery brigade headquarters planned forward moves for the guns and were kept ready to replace casualties. It was expected that much of the artillery would need to switch rapidly from the bombardment plan to engage counter-attacking German infantry. It was planned that the Forward Observation Officers of the divisions in the first attack onto the ridge would control the artillery which had remained in place and the reserve divisions advancing down the far slope to the Oosttaverne line would control the artillery hidden close to the front line and the artillery which advanced into no-man's-land. Franks planned to neutralise German guns within 9,000 yards (8,200 m) of the attack front. On the flanks of the British attack front of 17,000 yards (16,000 m), 169 German guns had been located, for which 42 British guns (25 percent of the German total) were set aside. The 299 German guns in the path of the attack were each to be engaged by a British gun, a formula which required 341 British guns and howitzers to be reserved for counter-battery fire. Every 45 yards (41 m) of front had a medium or heavy howitzer for bombardment, which required 378 guns, with 38 super-heavy guns and howitzers (5 percent) deployed with the field artillery that was due to fire the creeping and standing barrages. Franks devised a bombardment timetable and added arrangements for a massed machine-gun barrage. The 756 medium and heavy guns and howitzers were organised in forty groups and the 1,510 field guns and howitzers in sixty-four field artillery brigades within the attacking divisions and thirty-three Army field artillery brigades, divided among the three attacking corps.

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A policy on rapid movement had been devised in September 1916, in which the Army Wing and Corps Wings not attached to the corps moving forward, would move with army headquarters and the Corps Wings attached to the corps that were advancing, would keep as close to their associated corps headquarters as possible. Squadrons would not need to move every day and could arrange temporary landing-grounds. On 21 March 1917 the use of temporary facilities was ordered with portable hangars to be built near corps headquarters and aircraft flown back to their normal aerodromes at night. IV and V Brigades were involved in the advance, with their squadrons attached to divisions for contact-patrols. Two cavalry divisions were attached to the Fourth and Fifth armies for the advance, with aircraft for reconnaissances of the ground that the cavalry was to traverse and to help the cavalry maintain touch with the rear. Suitable targets found by air observation were engaged by artillery using the "zone call" system.

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Further north, the 169th Brigade was to advance to Polygon Wood through Glencorse Wood and 167th Brigade was to reach the north-western part of Polygon Wood through Nonne Bosschen. The 8th Division was to attack with two brigades, between Westhoek and the Ypres–Roulers railway, to the green line on the rise east of the Hanebeek stream. Eight tanks were allotted to II Corps to assist the infantry. The artillery support for the attack was the same as that for 10 August, 180 eighteen-pounder guns for the creeping barrage moving at 110 yd (100 m) in five minutes, with seventy-two 4.5-inch howitzers and 36 eighteen-pounders placing standing barrages beyond the final objective. Eight machine-gun companies were to fire barrages on the area from the north-east of Polygon Wood to west of Zonnebeke. XIX and XVIII corps further north, were also to capture the green line, slightly beyond the German Wilhelm (third) line. Each XIX Corps division had fourteen 18-pounder batteries for the creeping barrage and twenty-four 4.5-inch howitzer batteries and forty machine-guns for standing barrages, along with the normal heavy artillery groups. Each division also had 108 eighteen-pounders and thirty-six 4.5-inch howitzers for bombardment and benefitted from supply routes which had been far less heavily shelled than those further south. In the XVIII Corps area, a brigade each from the 48th and 11th divisions with eight tanks each, was to attack from the north end of St. Julien, to the White House east of Langemarck. The 20th Division planned to capture Langemarck with the 60th and 61st brigades. The 59th Brigade was to go into reserve after holding the line before the attack, less the two battalions in the front line, which were to screen the assembly of the attacking brigades. The attack was to begin on the east bank of the Steenbeek where the troops had 77–148 yd (70–135 m) of room to assemble, crossing over on wooden bridges laid by the engineers the night before the attack.

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The main French offensive in the south began on 14 August when the First Army advanced with two corps into the Vosges and two corps north-east towards Sarrebourg and the two right-hand corps of the Second Army of General de Castelnau advanced on the left of the First Army. One corps and the Second Group of Reserve Divisions advanced slowly towards Morhange in echelon, as a flank guard against a German attack from Metz. The First Army had captured several passes further south since 8 August, to protect the southern flank as the army advanced to Donon and Sarrebourg. Despite warnings from Joffre against divergence, the army was required to advance towards the Vosges passes to the south-east, eastwards towards Donon and north-east towards Sarrebourg. German troops withdrew during the day, Donon was captured and on the left flank an advance of 10–12 kilometres (6.2–7.5 mi) was made. At dusk the 26th Division of the XIII Corps attacked Cirey and were engaged by artillery and machine-guns and repulsed with many casualties. On 15 August, the Second Army reported that German long-range artillery had been able to bombard the French artillery and infantry undisturbed and that dug-in German infantry had inflicted many casualties on the French as they attacked.

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All corps aircraft carried 20-pound (9.1 kg) bombs to attack billets, transport, trenches and artillery-batteries. Offensive sweeps were flown by 27 Squadron and 60 Squadron from 11:30 a.m. – 7:00 p.m. but found few German aircraft and only an LVG was forced down. Two sets of patrols were flown, one by 24 Squadron in Airco DH.2s from Péronne to Pys and Gommecourt from 6:45 a.m. to nightfall, which met six German aircraft during the day and forced two down. The second set of patrols by pairs of Royal Aircraft Factory F.E.2bs were made by 22 Squadron between 4:12 a.m. and dusk, from Longueval to Cléry and Douchy to Miraumont. The squadron lost two aircraft and had one damaged but kept German aircraft away from the corps aircraft.

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Despite considerable difficulty, the field artillery was moved to within 4,000 yd (3,700 m) of the final objective and ample ammunition and field stores were brought forward. XIV Corps had 49 batteries of 312 × 18-pounder guns in groups, one for each division, the Guards group having 23 batteries; the medium and heavy artillery being grouped similarly. The arrangements agreed by Haig, Gough and Plumer on 2 October, the effect of the victory of 4 October and the disarray of the German defenders, led to the attack planned for 10 October being advanced to 9 October, with a second attack being arranged for 12 October. Attacking a front of 13,500 yd (12,300 m), it was intended to capture Passchendaele ridge in two stages. The first objective (red line) would be captured by a morning attack, which if successful and the cause of a general withdrawal by the Germans, would be followed-up by the reserve brigades of the attacking divisions, which would advance to the second objective (blue line) in the afternoon. On 7 October Haig cancelled the afternoon attack to the blue line due to the wet weather. On the southern flank of the attack, X Corps was to attack to hold German reserves around Becelaere and Gheluvelt. To the north, I Anzac Corps was to advance on the right flank of the main attack, with the 1st and 2nd Australian divisions, the 4th and 5th Australian divisions being in reserve. Further north, II Anzac Corps with the New Zealand and 3rd Australian divisions in reserve, was to attack two objectives, the 66th Division advancing along the main ridge, north of the Ypres–Roulers railway to just short of Passchendaele village and the 49th Division on either side of the Ravebeek stream, up Wallemolen spur to the Bellevue pillboxes. If the first objectives were reached, the reserve brigades were to attack the second objectives in the afternoon. The second objectives were 800–1,000 yd (730–910 m) ahead of the red line, beyond the village and the main ridge respectively. The reserve divisions were ready to move rapidly forward, by train from west of Ypres to continue the attack the next day. On the Fifth Army front, XVIII Corps with a brigade each from the 48th and 11th divisions, was to advance 1,200 yd (1,100 m) up Poelcappelle spur and towards Westroosebeke on the main ridge.

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Dallas contacted Chetwode at 10:50, blaming the delay on the difficulty of bringing the artillery forward, but confirmed he would be ready to launch the attack at 12:00. Due to communication breakdown, Dallas was unaware of the position of the artillery. He had phoned Desert Corps at "10.4" [sic] to be told that the 161st (Essex) Brigade and the 271st RFA were at Sheikh Nebhan. However, they had moved to an exposed position at El Burjabye before finding a covered position in the valley between the Burjabye and Es Sire Ridges. The artillery was in fact already in position and had begun firing at 10:10, although communications had not been established with headquarters. Fog has also been blamed for the delayed infantry attack.The artillery bombardment began at 12:00, although there was no artillery program, and the Ottoman defences had not been identified. Dallas received his orders at 11:00, and half an hour later Dobell and Chetwode ordered him to launch his attack forthwith.

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The French were pushed back from the heights of Hill 145 and Hill 119 (the Pimple) by 1:00 p.m. At the east end of the Lorette Spur the 28th Division was forced out of the first position. By afternoon, the left flank of XIV Corps had been uncovered near Carency. Rupprecht intended to use the remnants of the 5th Bavarian Reserve Division and the 115th Division to counter-attack and regain the lost positions. Instead, the 115th Division was sent to defend the right flank of the I Bavarian Reserve Corps and the 5th Bavarian Reserve Division was found to be too depleted to attack. Troops managed to counter-attack at Souchez and retook some ground, before being stopped by massed French artillery-fire around 8:00 p.m. By evening, Rupprecht knew that twelve French divisions had attacked four German divisions but believed that the French could be driven back. OHL sent the 117th Division to Douai and Rupprecht subordinated two regiments of the 58th Division to the I Bavarian Reserve Corps, for the counter-attack at Souchez. Artillery was sent to the east of Vimy Ridge, to support the attack. During the night, a French attack captured the front trenches astride the Béthune–Lens road and Lieutenant-General von Haenisch sent the last corps reserve to the 29th Division (Lieutenant-General Isbert); a counter-attack in the morning recovered the trenches. To the south-west of Carency, the trench to Souchez was lost, which left Carency almost surrounded. Rupprecht and Haenisch planned to counter-attack from Souchez to Neuville, with the I Bavarian Reserve Corps and the 58th and 115th divisions, rather than retire. At 4:00 p.m. French attacks began on the Lorette Spur and at Carency but were not able to push back the defenders. At 7:00 p.m., the 58th Division began the German counter-attack, with parts of the 115th Division to the south and at first made good progress, before being stopped by French defensive fire. The 28th Division headquarters began to fear that the line between Ablain and Carency would fall. On 10 May, the I Bavarian Reserve Division managed to retain its positions despite French attacks, particularly at Neuville on the right flank but several counter-attacks supported by parts of IV Corps and the 115th Division, recovered only small parts of the village. Next day, Fasbender doubted that the line from Ablain to Carency could be held and asked for more reinforcements. Falkenhayn released the 117th Division (General Kuntze) and sent the VIII Corps headquarters with the 16th Division to Douai as a replacement OHL reserve. To avoid a retirement, which would lead to the loss of the Lorette Spur, Rupprecht met the corps commanders and issued a standfast order, encouraged by the quietude of the French during the morning of 11 May. French attacks in the afternoon were poorly co-ordinated and repulsed with many casualties.

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British Expeditionary Force commander General Douglas Haig and Second Army commander General Herbert Plumer both believed it necessary to expel the Germans from the captured positions. In view of the preparations for the Somme offensive, Haig did not wish to divert more forces than were necessary. Support was limited to a number of additional artillery units and an infantry brigade from the 20th Light Division. It was suggested that the next counterattack be carried out with the infantry available, with a particularly large emphasis placed on artillery. The additional artillery units immediately went to work hampering German consolidation, by shelling their front and support lines and seeking out hostile batteries.

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This firepower gave a density of one heavy gun for every 18 metres (20 yd) and one field gun for every 9.1 metres (10 yd) of Canadian Corps frontage,representing a considerable average increase, including three times the heavy guns, over the distribution of artillery at the Battle of the Somme a year earlier. Brigadier-General Edward Morrison developed and subsequently issued a 35-page multi-phased fire support plan called Canadian Corps Artillery Instruction No. 1 for the Capture of Vimy Ridge to support the efforts of the infantry.　For its operations, the Canadian Corps received three times the artillery normally assigned to a corps for regular operations.　To manage the logistics associated with the increased artillery, Royal Artillery staff officer Major Alan Brooke developed coordinated communication and transport plans to work in conjunction with the complex barrage plans. A 1.6 million shell allotment allowed the artillery along the Canadian Corps front to maintain a high sustained rate of fire. Improvements in the quality of the shells compared to those used earlier in the war ensured fewer duds.

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German work on the Siegfriedstellung/Hindenburg Line continued but the first line, built along reverse-slopes was complete and from which flanking-fire could be brought to bear on any attack. Concrete machine-gun emplacements proved immune to all but the heaviest and most accurate howitzer-fire and the main position was protected by an observation line along the crest in front, which commanded no man's land, which was 800–1,200 yards (730–1,100 m) deep. The British Fourth Army was unable to assist the French with an attack, due to a lack of divisions after transfers north to the British Third Army but was able to assist with artillery-fire from the north and kept a cavalry division in readiness to join a pursuit. The French artillery had been reduced to c. 250 guns by transfers south to GAR, which was insufficient to bombard the German defences and conduct counter-batter fire simultaneously. On 13 April at 5:00 a.m., XIII Corps attacked with two divisions; the 26th Division on the right took the German first line and then defeated two German counter-attacks but the 25th Division on the left was repulsed almost immediately by uncut wire and machine-gun fire, despite French field artillery being advanced into no man's land at the last minute to cut the wire. Casualties in the thirteen attacking battalions were severe.

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Firepower could conserve infantry but a battle of material prolonged the war and consumed the troops which were preserved in each battle. In 1915 and early 1916, German industry quintupled the output of heavy artillery and doubled the production of super-heavy artillery. French production had also recovered since 1914 and by February 1916, the army had 3,500 heavy guns. In May 1916, Joffre implemented a plan to issue each division with two groups of 155 mm guns and each corps with four groups of long-range guns. Both sides at Verdun had the means to fire huge numbers of heavy shells to suppress defences, before risking infantry movements. At the end of May, the Germans had 1,730 heavy guns at Verdun against 548 French, which were sufficient to contain the Germans but not enough for a counter-offensive.

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With the Imperial Mounted Division, remaining in position to cover the retirement of the Anzac Mounted Division, the withdrawal of the fighting mounted units was slow and difficult, not because of hostile pressure (there was none until dawn), but because the units were intermixed and the dismounted troops were far from their horses. One unit, the 7th Light Horse Regiment (2nd Light Horse Brigade) was nearly 4 miles (6.4 km) from their horses and all their wounded had not yet been collected.The No. 7 Light Car Patrol reported to the headquarters of the Anzac Mounted Division at 18:40 and was ordered to return to base, while the cars of the Nos. 11 and 12 LAMB, camped in the vicinity of Kh er Reseim. At 19:05 Anzac Mounted Division's artillery began its retirement from divisional headquarters under escort, and the 43 wounded from the Anzac Mounted Division and 37 wounded from Imperial Mounted Division were collected and brought to the ambulances, while prisoners were sent back under escort. By 19:30 the 22nd Mounted Brigade was moving toward Divisional Headquarters and the 6th Mounted Brigade withdrew while Ottoman soldiers dug in on Hill 405.

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The 6th Army line from La Bassée to Armentières and Menin, was ordered not to attack until the operations of the new 4th Army in Belgium had begun. Both armies attacked on 20 October, the XIV, VII, XIII and XIX corps of the 6th Army making a general attack from Arras to Armentières. Next day the northern corps of the 6th Army attacked from La Bassée to St Yves and gained little ground but prevented British and French troops from being moved north to Ypres and the Yser fronts. On 27 October, Falkenhayn ordered the 6th Army to move heavy artillery north for the maximum effort due on 29 October at Gheluvelt, to reduce its attacks on the southern flank against II and III corps and to cease offensive operations against the French further south. Armeegruppe von Fabeck was formed from XIII Corps and reinforcements from the armies around Verdun, which further depleted the 6th Army and ended the offensive from La Bassée north to the Lys. On 14 and 15 October, II Corps attacked on both sides of La Bassée Canal and German counter-attacks were made each night. The British managed short advances on the flanks, with help from French cavalry but lost 967 casualties. From 16 to 18 October, II Corps attacks pivoted on the right and the left flank advanced to Aubers, against German opposition at every ditch and bridge, which inflicted another thousand casualties. Givenchy was recaptured by the British on 16 October, Violaines was taken and a foothold established on Aubers Ridge on 17 October; French cavalry captured Fromelles. On 18 October, German resistance increased as the German XIII Corps arrived, reinforced the VII Corps and gradually forced the II Corps to a halt. On 19 October, British infantry and French cavalry captured Le Pilly (Herlies) but were forced to retire by German artillery-fire. The fresh German 13th Division and 14th Division arrived and began to counter-attack against all of the II Corps front. At the end of 20 October, the II Corps was ordered to dig in from the canal near Givenchy, to Violaines, Illies, Herlies and Riez, while offensive operations continued to the north. The countryside was flat, marshy and cut by many streams, which in many places made trench digging impractical, so breastworks built upwards were substituted, despite being conspicuous and easy to demolish with artillery-fire. (It was not until late October that the British received adequate supplies of sandbags and barbed wire.)The British field artillery was allotted to infantry brigades and the 60-pounders and howitzers were reserved for counter-battery fire. The decision to dig in narrowly forestalled a German counter-offensive which began on 20 October, mainly further north against the French XXI Corps and spread south on 21 October, to the 3rd Division area.

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