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ドイツの防御策の変化と制限された攻撃の影響力
- イギリス軍の攻勢の一時中断は、ドイツ軍を惑わせ、ドイツのスタッフオフィサーはそれを「ほとんど退屈」と評した。
- イギリス軍の進撃はスムーズで、目標地点に到達したときには、ドイツ軍の反撃部隊は驚愕した。
- ドイツ軍の防御体制は、戦闘の終わりまで期待されていたように機能せず、ドイツ軍指揮官は防御策の変更を余儀なくされた。
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By the time the offensive began in April 1917, the Germans had received intelligence of the Allied plan and strengthened their defences on the Aisne front. The German retreat to the Hindenburg Line (Operation Alberich) left a belt of devastated ground up to 25 miles (40 km) deep in front of the French positions facing east from Soissons, northwards to St. Quentin. Operation Alberich freed 13–14 German divisions, which were moved to the Aisne, increasing the German garrison to 38 divisions against 53 French divisions. The German withdrawal forestalled the attacks of the British and Groupe d'armées du Nord (GAN) but also freed French divisions. By late March, GAN had been reduced by eleven infantry, two cavalry divisions and 50 heavy guns, which went into the French strategic reserve. When Hindenburg and Ludendorff took over from Falkenhayn on 28 August 1916, the pressure being placed on the German army in France was so great that new defensive arrangements, based on the principles of depth, invisibility and immediate counter-action were formally adopted, as the only means by which the growing material strength of the French and British armies could be countered. Instead of fighting the defensive battle in the front line or from shell-hole positions near it, the main fight was to take place behind the front line, out of view and out of range of enemy field artillery.
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Casualties in the 33rd Division were so great that it was relieved on 27 September by the 23rd Division, which had only been withdrawn on the night of 24/25 September. Battle of Polygon Wood ポリゴンの森の戦い Australian infantry with small box respirator gas masks, Ypres, September 1917 The Second Army altered its Corps frontages soon after the attack of 20 September, for the next effort (26 September – 3 October) so that each attacking division could be concentrated on a 1,000 yards (910 m) front. Roads and light railways were extended to the new front line, to allow artillery and ammunition to be moved forward. The artillery of VIII Corps and IX Corps on the southern flank, simulated preparations for attacks on Zandvoorde and Warneton. At 5.50 a.m. on 26 September, five layers of barrage fired by British artillery and machine-guns began. Dust and smoke thickened the morning mist and the infantry advanced using compass bearings. Each of the three German ground-holding divisions attacked on 26 September, had an Eingreif division in support, twice the ratio of 20 September. No ground captured by the British was lost and German counter-attacks managed only to reach ground to which survivors of the front-line divisions had retired. Battle of Broodseinde ブルードサインデの戦い The Battle of Broodseinde (4 October), was the last assault launched by Plumer in good weather. The operation aimed to complete the capture of the Gheluvelt Plateau and occupy Broodseinde Ridge. The Germans sought to recapture their defences around Zonnebeke, with a methodical counter-attack also to begin on 4 October. The British attacked along a 14,000 yards (13,000 m) front and by coincidence, Australian troops from I Anzac Corps met attacking troops from the German 45th Reserve Division in no man's land when Operation Hohensturm commenced simultaneously. The Germans had reinforced their front line to delay the British capture of their forward positions, until Eingreif divisions could intervene, which put more German troops into the area most vulnerable to British artillery. The British inflicted devastating casualties on the 4th Army divisions opposite.
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Attacking with 23 battalions (from four divisions), the German forces managed to penetrate the Australian front line at the junction on the 1st Australian Division and 2nd Australian Division and occupy the village of Lagnicourt (damaging some Australian artillery pieces). Counter-attacks from the Australian 9th and 20th Australian battalions, restored the front line, and the action ended with the Australians suffering 1,010 casualties, against 2,313 German casualties. ]Battle of Bullecourt (3–17 May 1917) After the initial assault around Bullecourt failed to penetrate the German lines, British commanders made preparations for a second attempt. British artillery began an intense bombardment of the village, which by 20 April had been virtually destroyed. Although the infantry assault was planned for 20 April, it was pushed back a number of times and finally set for the early morning of 3 May. At 03:45, elements of the 2nd Australian Division attacked east of Bullecourt village, intending to pierce the Hindenburg Line and capture Hendecourt-lès-Cagnicourt, while British troops from the 62nd (2nd West Riding) Division attacked Bullecourt, which was finally taken by the British 7th Division and despite determined effort by the Germans was held by the British 62nd Division.
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The increased amount of heavy artillery was to be used to destroy German concrete shelters and machine-gun nests, which were more numerous in German "battle zones", than the "outpost zones" which had been captured in July and August and to engage in more counter-battery fire. Few German concrete pill-boxes and machine gun nests had been destroyed during earlier preparatory bombardments and attempts at precision bombardment between attacks had also failed. The 112 heavy and 210 field guns and howitzers in the Second Army on 31 July, were increased to 575 heavy and medium and 720 field guns and howitzers for the battle, which was equivalent to one artillery piece for every 5 ft (1.5 m) of the attack front and more than double the density in the Battle of Pilckem Ridge. Plumer's tactical refinements sought to undermine the German defence by making a shallower penetration and then fighting the principal battle against German counter-attack (Eingreif) divisions. By further reorganising infantry reserves, Plumer ensured that the depth of the attacking divisions roughly corresponded to the depth of local German counter-attack reserves and their Eingreif divisions. More infantry was provided for the later stages of the advance, to defeat German counter-attacks, by advancing no more than 1,500 yd (1,400 m) before consolidating their position. When the Germans counter-attacked they would encounter a British defence-in-depth, protected by artillery and suffer heavy casualties to little effect, rather than the small and disorganised groups of British infantry that the Germans had driven back to the black line on the XIX Corps front on 31 July. Minor operations During a lull in early September, both sides tried to improve their positions; on 1 September, a determined German attack at Inverness Copse was repulsed. Further north in the XIX Corps area, a battalion of the 61st Division rushed Hill 35 but only took a small area; another attempt on 3 September failed.
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After dawn, aerodromes were periodically to be attacked by small formations of low-flying fighters and by day bombers from high-altitude. German defensive preparations Main article: German defensive preparations: June–July 1917 From mid-1917, the area east of Ypres was defended by six German defensive positions the front position, Albrechtstellung (second position), Wilhemstellung (third position), Flandern I Stellung (fourth position), Flandern II Stellung (fifth position) and Flandern III Stellung (under construction). Between the German defence positions, lay the Belgian villages of Zonnebeke and Passchendaele. "Elastic" defence tactics had been rejected by the 4th Army Chief of Staff, Major-General Fritz von Loßberg, who believed that a tactical withdrawal by trench garrisons would disorganise the counter-attacking reserves, leading to the loss of the sector and danger to flanking units. Loßberg ordered the front line of sentry groups (Postengraben) to be held rigidly; British attacks would exhaust themselves and then be repulsed by local German reserves or by Eingreif divisions. Loßberg also judged that there was little prospect of British attacks being delayed by their need to move artillery forward and build supply routes. The British had a huge mass of artillery and the infrastructure necessary to supply it with ammunition, much of it built opposite the Flandern I Stellung in the period between the attack at Messines and 31 July. German defensive tactics had been costly but succeeded on the front of XIX Corps on 31 July and against II Corps on the Gheluvelt Plateau on 31 July and during August, although the counter-attacks had been stopped in their turn by British artillery fire, when they reached areas where observation and communications between British infantry and artillery had been restored. Ludendorff later wrote that losses in the August battles had been unexpectedly high. The pause in British operations in early September helped to mislead the Germans. General von Kuhl (Chief of Staff, Army Group Crown Prince Rupprecht) doubted that the offensive had ended but by 13 September had changed his mind.
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During the British infantry advances, German artillery managed a considerable amount of counter-battery fire, particularly from Zillebeke to Verbrandenmolen but this was not enough to stop the British artillery heavily bombarding German reserve battalions of the Stellungsdivisionen (ground-holding divisions), as they made futile attempts to counter-attack from 10:00 a.m. – 1.30 p.m. At 1:48 p.m. the British standing barrage in front of the new line ended. British air reconnaissance from zero hour was conducted by a contact aeroplane over each corps area, to observe the progress of the British infantry and one counter-attack observation machine watching for German counter-attacks, from which German Eingreif units were seen advancing from the Flandern III Stellung at Menin, Moorslede and Westroosebeek. During the day 394 wireless messages were received from British observation aircraft and about 1⁄3 of the reports resulting in immediate artillery fire. After 3.00 p.m., approximately three German infantry battalions were reported north of the Menin Road, moving up the Reutelbeek valley towards Polderhoek and a similar force with field artillery was seen moving west towards I Anzac Corps at Polygon Wood and Anzac spur. Another force was observed descending from the Poelcappelle spur at Westroosebeek, towards positions held by the Fifth Army. The troops were the leading regiments of three Eingreifdivisionen, 16th Bavarian from Gheluwe, 236th Division from Moorslede and 234th Division from Oostniewkirke. The 16th Bavarian Division counter-attack plan "Get Closer" (Näher heran) had been ordered at 5:15 a.m. and by 9:00 a.m., the division had advanced towards the area between Polygon Wood and Inverness Copse. British medium and heavy artillery fired on the German units, which were forced to deploy and advance from cover. After a considerable delay, the survivors reached British machine-gun range, as their artillery support overshot the British positions. Visibility was still exceptionally good, with the sun behind the British and Australians, who were easily able to see movement in front of them on the Gheluvelt plateau.
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To overcome the German defensive system, which had been made more formidable by the unusually rainy weather in August, making movement much more difficult and forcing the British to keep to duck board tracks, easy to identify and bombard, objectives had been chosen which provided British infantry with good positions from which to face German counter-attacks, rather than to advance to the maximum distance before digging-in. The Fifth Army had set objectives much closer than 3,000–3,500 yd (2,700–3,200 m) after 31 July and the Second Army methods of September were based on SS 144 The Normal Formation for the Attack (February 1917), reflecting the experience of the fighting in August and to exploit opportunities made possible by the reinforcement of the Flanders front with another 626 artillery pieces by Sir Douglas Haig, during the operational pause before 20 September. The methods based on the Second Army Note of 31 August, had proved themselves on 20 September and were to be repeated. The attack of 20 September, had used the extra infantry made available by narrowing attack frontages and increasing the number of divisions, to have greater depth than those of August, with several widely spaced lines of infantry in front of section columns, snaking round shell-holes and patches of mud, ready to surround German pillboxes, with increased numbers of support waves ready to leap-frog through and reserves ready to intervene, during delays and German counter-attacks. Intermediate objectives were chosen which required a shorter distance to be covered and the number of infantry attacking the first objective were reduced, since the German garrisons in the forward defended areas were small and dispersed. British troops involved in the first advance were lightly equipped, to allow them to move more quickly, to avoid German counter-barrages and get through the relatively empty area up to the first objective.
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The infliction of many casualties on the German front divisions and the capture of the villages of Courcelette, Martinpuich and Flers had been a considerable tactical victory but the German defensive success on the British right flank, made exploitation and the use of cavalry impossible. Tanks were used in battle for the first time in history and the Canadian Corps and the New Zealand Division fought for the first time on the Somme. On 16 September, Jagdstaffel 2, a specialist fighter squadron, began operations with five new Albatros D.I fighters, which were capable of challenging British air supremacy for the first time since the beginning of the battle.
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Byng had commanded the Canadian Corps who took Vimy Ridge at the Battle of Arras (1917) and the Battle of Cambrai (1917) and Gough had commanded the Reserve Army (renamed the Fifth Army in October 1916), which had taken over part of the Somme battlefront in July 1916. The Fifth Army held the longest front of the BEF, with twelve divisions and three cavalry divisions, 1,650 guns, 119 tanks and 357 aircraft. An average British division in 1918 consisted of 11,800 men, 3,670 horses and mules, 48 artillery pieces, 36 mortars, 64 Vickers heavy machine guns, 144 Lewis light machine-guns, 770 carts and wagons, 360 motorcycles and bicycles, 14 trucks, cars and 21 motorised ambulances. In the Weekly Intelligence Summary of 10 March 1918, British intelligence predicted a German offensive in the Arras–St. Quentin area based on air reconnaissance photographs and the testimony of deserters; the prediction was reiterated in the next summary on 17 March. Allied aircraft had photographed German preparations, new supply roads had been constructed and shell craters had been turned into concealed trench mortar batteries. Heavily laden motorised and horse-drawn transports had been seen heading into St. Quentin from the east, and in the distance German officers were observed studying British lines. The British replied with nightly bombardments of the German front line, rear areas and possible assembly areas. A few days before the attack, two German deserters slipped through No Man's Land and surrendered to the 107th Brigade. They spoke of troops, batteries of artillery and trench mortars massing on the German front. They reported massed trench mortars directly in front of 36th Division lines for wire cutting and an artillery bombardment, lasting several hours, as a preliminary to an infantry assault. The war diary of the 9th (Service) Battalion, Royal Irish Fusiliers describes their activities from 18–20 March as being intensive training during the day, with specialist training in the evening. During the night of 20 March, troops of the 61st (2nd South Midland) Division conducted a raid on German positions and took more prisoners, who told them that the offensive would be launched the following morning.
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German defensive changes: late 1917 On 7 October, the 4th Army again dispersed its troops in the front defence zone. Reserve battalions moved back behind the artillery protective line and the Eingreif divisions were organised to intervene as swiftly as possible once an attack commenced, despite the risk of being devastated by the British artillery. Counter-battery fire to reduce British artillery fire was to be increased, to protect the Eingreif divisions as they advanced. All of the German divisions holding front zones were relieved and an extra division brought forward, as the British advances had lengthened the front line. Without the forces necessary for a counter-offensive south of the Gheluvelt plateau towards Kemmel Hill, Rupprecht began to plan for a slow withdrawal from the Ypres salient, even at the risk of uncovering German positions further north and the Belgian coast. Battle of Poelcappelle The French First Army and British Second and Fifth armies attacked on 9 October, on a 13,500 yards (12,300 m) front, from south of Broodseinde to St. Jansbeek, to advance half of the distance from Broodseinde ridge to Passchendaele, on the main front, which led to many casualties on both sides. Advances in the north of the attack front were retained by British and French troops but most of the ground taken in front of Passchendaele and on the Becelaere and Gheluvelt spurs was lost to German counter-attacks. General William Birdwood later wrote that the return of heavy rain and mud sloughs was the main cause of the failure to hold captured ground. Kuhl concluded that the fighting strained German fighting power to the limit but that the German forces managed to prevent a breakthrough, although it was becoming much harder to replace losses. First Battle of Passchendaele Passchendaele:パッシェンデール The First Battle of Passchendaele on 12 October, was another Allied attempt to gain ground around Passchendaele. Heavy rain and mud again made movement difficult and little artillery could be brought closer to the front. Allied troops were exhausted and morale had fallen.
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