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大成功とその後の挫折：第一次世界大戦中の攻撃作戦
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＞A cavalry division was given to each army, to operate with the reserve divisions, two tank battalions were attached to the Second Army and a tank brigade to the Fifth Army to exploit the firmer going, should the advances take place. In the early morning of 4 October, news arrived at British Headquarters (HQ) of the great success of the attack. Brigadier-General Charteris, Chief Intelligence Officer at General Headquarters, was sent from Haig's Advanced HQ to the Second Army HQ to discuss a possible exploitation. ⇒各方面軍は、数個予備師団と作戦行動をともにするために騎兵隊1個師団が与えられていた。第2方面軍には2個の戦車大隊が配属され、第5方面軍には1個の戦車旅団が配属されていた。進軍の必要が起こったときに、よりしっかり通路状態を開発するためであった。10月4日の早朝に、攻撃大成功のニュースが英国軍本部（HQ）に着いた。総司令部の諜報局長官チャータリス准将は、可能な開発利用を議論するために、ヘイグの前進本部から第2方面軍本部へ出向いた。 ＞Plumer did not agree that exploitation was possible, because eight more uncommitted German divisions were behind the battlefield and there were another six beyond them; Plumer preferred to wait until the expected German counter-attacks that day had been defeated. German artillery fire was still heavy and the Flandern II and Flandern III Stellungen (defence lines) behind the attack front could be occupied by the fresh German divisions. ⇒プルマーは、未参戦のドイツ軍8個師団が戦場背後にあり、別の6個師団がその向こうに控えていたので、開発利用が可能であることに合意しなかった。プルマーはむしろ、その日に予想されたドイツ軍の反撃が敗退するまで待機することを望んだ。（しかし）ドイツ軍の大砲火はまだ重く、攻撃前線のフランドル第I、第III陣地（防御戦線）は、活気あるドイツ軍師団によって占拠されている可能性があった。 ＞An attack on these defensive lines would need close artillery support, which would be impossible because the British artillery was behind a severely battered strip of muddy ground 2 mi (3.2 km) wide. As the magnitude of the victory became apparent, Plumer had second thoughts but by 2:00 p.m., accepted that the moment had passed. On the Fifth Army front, an attempt to get further forward was ordered by Gough and then cancelled, after a local German counter-attack was reported to have pushed the 4th Division off 19 Metre Hill. ⇒これらの防御戦線への攻撃には、近くからの大砲支援が必要であったが、英国軍の野戦砲は、厳しく砲撃乱打された幅2マイル（3.2キロ）のどろどろした傾斜地の背後にあったので、それは不可能だった。勝利の大きさのほどが明白になったので、プルマーは第2の考えを抱いたが、それを着想した午後2時までに時宜は過ぎ去っていた。第5方面軍前線では、さらに前方を取る試みがゴフによって命じられたが、局地ドイツ軍の反撃の後、19メートル・ヒルから第4師団が立ち去ったと報告された後に中止された。 ＞Rain fell again on 4 October, continued on 5 and 6 October then became a downpour on 7 October. On 5 October, General Birdwood commander of I Anzac Corps told Plumer that the exploitation would not be possible, as the Corps light railway and the Westhoek to Zonnebeke road could not carry forward all the artillery necessary. On 7 October Haig cancelled the exploitation attack to the second objectives (red line), intended for the afternoon of 9 October. The rain stopped that night and the ground began to dry on 8 October, until late afternoon when another downpour began. From 4–9 October, over 30 millimetres (1.2 in) of rain fell, in a month when average rainfall was 75 millimetres (3.0 in). ⇒10月4日、再び雨になり、10月5日、6日と続いて、10月7日はどしゃ降りになった。10月5日、第Iアンザック軍団の司令官バードウッド将軍がプルマーに、軍団の軽便鉄道やウェストホークからゾンネベケに至る道路で必要な大砲をすべて運ぶことができるわけではないので、開発利用は不可能だろうと語った。10月7日にヘイグは、第2標的（赤線部）への開発利用の攻撃を中止し、それを10月9日の午後とするつもりになった。その（7日の）夜雨がやみ、10月8日に地面は乾燥し始めたが、その日の午後遅くに別のどしゃ降りが始まった。1か月の平均降雨は75ミリ（3インチ）であったが、10月4日－9日（だけ）で30ミリ（1.2インチ）を超える降雨があった。
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The Second Army had to attack methodically after artillery preparation but managed to push back the German defenders. Intelligence reports identified a main line of resistance of the German 6th Army and 7th Army, which had been combined under the command of Crown Prince Rupprecht of Bavaria, close to the advanced French troops and that a counter-offensive was imminent. On 16 August, the Germans opposed the advance with long-range artillery fire and on 17 August, the First Army reinforced the advance on Sarrebourg. When the Germans were found to have left the city Joffre ordered the Second Army to incline further to the north, which had the effect of increasing the divergence of the French armies.
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Reserve formations of infantry, artillery, cavalry and tanks were to be made ready behind the Fifth and Second armies, to exploit a successful attack. Gough and Plumer replied over the next couple of days, that they felt that the proposals were premature and that exploitation would not be feasible until Passchendaele ridge had been captured as far as Westroosebeke. Capturing the ridge would probably take two more steps at three-day intervals, followed by another four days to repair roads over the captured ground. Haig explained that although exploitation of the attack due on 10 October was not certain, he desired the arrangements to be made since they could be used at a later date. British offensive preparations Main article: The British set-piece attack in late 1917 The British tactical refinements had sought to undermine the German defence-in-depth, by limiting objectives to a shallower penetration and then fighting the principal battle against Eingreif divisions as they counter-attacked, rather than against the local defenders. By further reorganising the infantry reserves, Plumer had ensured that the depth of the attacking divisions corresponded closer to the depth of the local German counter-attack reserves and their Eingreif divisions, providing more support for the advance and consolidation against German counter-attacks. Divisions attacked on narrower fronts and troops advanced no more than 1,500 yd (1,400 m) into the German defence zone, before consolidating their position. When the Germans counter-attacked, they encountered a reciprocal defence-in-depth, protected by a mass of artillery like the British green and black lines on 31 July and suffered many casualties to little effect. The tempo of the British operations added to the difficulty the Germans had in replacing tired divisions through the transport bottlenecks behind the German front. The Battle of the Menin Road Ridge on 20 September, was the first attack with the more limited territorial objectives developed since 31 July, to benefit from the artillery reinforcements brought into the Second Army area and a pause of three weeks for preparation, during which the clouds dispersed and the sun began to dry the ground.
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As news arrived of the great success of the attack, Brigadier-General Charteris, head of GHQ Intelligence, went from Haig's advanced headquarters to the Second Army Headquarters to discuss a possible exploitation. Plumer declined the suggestion, as eight fresh German divisions were behind the battlefield with another six beyond them. Plumer preferred to wait until the expected German counter-attacks had been defeated, as Haig had directed. German artillery fire was heavy and the defences of the Flandern II and Flandern III stellungen could be garrisoned by German divisions behind the attack front. An attack on these fortifications would need artillery support, which would be limited, given that the British field artillery was behind a severely battered strip of muddy ground 2 mi (3.2 km) deep, firing close to the limit of their range. Later in the day, Plumer had second thoughts and ordered I Anzac Corps to push on to the Keiberg spur, with support from II Anzac Corps. Lieutenant-General Alexander Godley the II Anzac Corps commander, wanted to advance north-eastwards, towards Passchendaele village but Lieutenant-General William Birdwood of I Anzac Corps, wanted to wait until artillery had been brought up and supply routes improved. The X Corps commander, Lieutenant-General Thomas Morland proposed an attack northwards, from In de Ster into the southern flank of the Germans opposite I Anzac Corps, which was opposed by Major-General Herbert Shoubridge the 7th Division commander, due to uncertainty and the many casualties in the 21st Division on his right flank. At 2:00 p.m. Plumer decided that exploitation was not possible. At 10:30 a.m., Gough told the Fifth Army corps commanders to push on and to attack again at 5:00 p.m. but when reports arrived of a repulse of the 4th Division at 19 Metre Hill, at the junction of XVIII and XIV Corps, the attack was cancelled. The capture of the ridges was a great success, Plumer called the attack "... the greatest victory since the Marne" and the German Official History referred to "... the black day of October 4". There had been an average advance of 1,000 yd (910 m) and the 3rd Australian Division moved forward up to 1,900 yd (1,700 m).
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Two squadrons were reserved for close air support on the battlefield and low attacks on German airfields. The British planned to advance on a 17,000-yard (16,000 m) front, from St. Yves to Mt. Sorrel east to the Oosttaverne line, a maximum depth of 3,000 yards (2,700 m). Three intermediate objectives to be reached a day at a time became halts, where fresh infantry would leap-frog through to gain the ridge in one day. In the afternoon a further advance down the ridge was to be made. The attack was to be conducted by three corps of the Second Army (General Sir Herbert Plumer): II Anzac Corps in the south-east was to advance 800 yards (730 m), IX Corps in the centre was to attack on a 5,000 yards (4,600 m) front, which would taper to 2,000 yards (1,800 m) at the summit and X Corps in the north had an attack front of 1,200 yards (1,100 m). The corps planned their attacks under the supervision of the army commander, using as guides, the analyses of the Somme operations of 1916 and successful features of the attack at Arras on 9 April. Great care was taken in the planning of counter-battery fire, the artillery barrage time-table and machine-gun barrages. German artillery positions and the second (Höhen) line were not visible to British ground observers. For observation over the rear slopes of the ridge, 300 aircraft were concentrated in II Brigade RFC and eight balloons of II Kite Balloon Wing were placed 3,000–5,000 feet (910–1,520 m) behind the British front line. The Second Army artillery commander, Major-General George Franks, co-ordinated the corps artillery plans, particularly the heavy artillery arrangements to suppress German artillery, which were devised by the corps and divisional artillery commanders.
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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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Haig wanted reserve formations of infantry, artillery, cavalry and tanks to be ready to extend a successful attack. Gough and Plumer replied over the next couple of days, that they felt that Haig's proposals were premature and that exploitation would not be feasible until Passchendaele ridge had been captured from Passchendaele northwards to Westroosebeke. Gough and Plumer thought that this would probably take two more steps at three-day intervals and then another four days to repair roads over the captured ground. Haig considered that although a collapse of the German defence was a condition for exploitation of the attack due on 10 October which was not certain, he desired the arrangements to be made, since they would be available for a later date. At another conference on 2 October, Haig announced that operations at Ypres would continue for as long as the weather permitted, that six fresh divisions were being moved from quiet fronts to the Fifth Army and that the Canadian Corps was being moved to the Second Army. The arrangements to be made for immediate exploitation, should the attack intended for 10 October be as successful as hoped, were that each attacking division was to keep its reserve brigade lightly equipped and accompanied by two 60-pounder batteries, two 6-inch howitzer batteries and four field artillery brigades. If the infantry brigades conducting the morning attack reported a big success, their reserve brigades would continue the advance in the afternoon. The reserve brigades of the attacking divisions of I and II Anzac corps were to reach Drogenbroodhoek in the south, 3,000 yd (2,700 m) beyond Broodseinde, Passchendaele station on the Morslede road in the centre and gain touch with the Fifth Army on the Westroosebeke road north of Passchendaele. A reserve division of each corps was to be ready behind the front, which the Director-General of Transportation Major-General Nash, undertook to have on the battlefield in 3 1⁄2–4 hours, if given three hours' notice. The divisions in corps reserve would be ready by the following morning to advance beyond the reserve brigades, if German resistance crumbled.
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The Second Army had to attack methodically after artillery preparation but managed to push back the German defenders. Intelligence reports identified a main line of resistance of the German 6th Army and 7th Army, which had been combined under the command of Crown Prince Rupprecht of Bavaria, close to the advanced French troops and that a counter-offensive was imminent. On 16 August, the Germans opposed the advance with long-range artillery fire and on 17 August, the First Army reinforced the advance on Sarrebourg. When the Germans were found to have left the city Joffre ordered the Second Army to incline further to the north, which had the effect of increasing the divergence of the French armies. A German counter-attack on 20 August forced separate battles on the French armies, which were defeated and forced to retreat in disorder. The German pursuit was slow and Castelnau was able to occupy positions east of Nancy and extend the right wing towards the south, to regain touch with the First Army. During 22 August, the right flank was attacked and driven back 25 kilometres (16 mi) from the position where the offensive had begun on 14 August. The First Army withdrew but managed to maintain contact with the Second Army and on 24 August, both armies began a counter-offensive at the Trouée de Charmes and regained the line of 14 August by early September.
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On 7 October, Rupprecht anticipated a British attack north of the Ancre river in mid-October, anxiety about the situation at Verdun also increased and on 19 October, the dispatch of reinforcements from Verdun to the Somme was suspended. Defeats inflicted by the French Tenth Army (10–21 October) led to the sacking of the 2nd Army Chief of Staff, Bronsart von Schellendorf. Hindenburg and Ludendorff demanded domestic changes to complement their strategy changes. German workers were to be subjected to an Auxiliary Service Law (Hilfsdienstgesetz) that subjected all Germans from 16–50 years old to compulsory service, from November 1916. The new programme was intended to create a trebling of artillery and machine-gun output and a doubling of munitions and trench mortar production. Expansion of the army and output of war materials caused increased competition for manpower between the army and industry.
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The British set-piece attack in late 1917 The German 4th Army had held on to the Gheluvelt plateau during August in a costly defensive success, which worsened the manpower shortage that the German defensive strategy for 1917 was intended to remedy. Haig transferred command of the offensive to General Plumer, the Second Army commander on 25 August and moved the northern boundary of the Second Army closer to the Ypres–Roulers railway. More heavy artillery was sent to Flanders from the armies further south and placed opposite the Gheluvelt plateau. Plumer continued the development of British attacking methods, which had also taken place in the Fifth Army, during the slow and costly progress in August, against the German defence-in-depth and the unusually wet weather. After a pause of about three weeks, Plumer intended to capture Gheluvelt plateau in four steps, with six days between each step to allow time to bring forward artillery and supplies. Each attack was to have limited geographical objectives like the attacks in August, with infantry brigades re-organised to attack the first objective with one battalion each and the final one with two battalions. Derelict tank used as the roof of a dug out, Zillebeke, 20 September 1917 (Q6416) Plumer arranged for much more medium and heavy artillery to be added to the creeping bombardment, which had been impossible with the amount of artillery available to Gough. The revised attack organisation was intended to have more infantry attacking on narrower fronts, to a shallower depth than the attack of 31 July. The quicker and shorter advances were intended to be consolidated on tactically advantageous ground (particularly on reverse slopes), with the infantry in contact with their artillery and air support, ready to repulse counter-attacks. The faster tempo of the operations was intended to add to German difficulties in replacing tired divisions through the transport bottlenecks behind the German front.
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Preparations for operations in Flanders began in 1915, with the doubling of the Hazebrouck–Ypres rail line and the building of a new line from Bergues–Proven which was doubled in early 1917. Progress on roads, rail lines, railheads and spurs in the Second Army zone was continuous and by mid-1917, gave the area the most efficient supply system of the BEF. Several plans and memoranda for a Flanders offensive were produced between January 1916 and May 1917, in which the writers tried to relate the offensive resources available to the terrain and the likely German defence. In early 1916, the importance of the capture of the Gheluvelt plateau for an advance further north was emphasised by Haig and the army commanders. On 14 February 1917, Colonel C. N. Macmullen of GHQ proposed that the plateau be taken by a mass tank attack, reducing the need for artillery; in April a reconnaissance by Captain G. le Q Martel found that the area was unsuitable for tanks. On 9 February, General Rawlinson, commander of the Fourth Army, suggested that Messines Ridge could be taken in one day and that the capture of the Gheluvelt plateau should be fundamental to the attack further north. He suggested that the southern attack from St. Yves to Mont Sorrel should come first and that Mont Sorrel to Steenstraat should be attacked within 48–72 hours. After discussions with Rawlinson and Plumer and the incorporation of Haig's changes, Macmullen submitted his memorandum on 14 February. With amendments the memorandum became the GHQ 1917 plan. A week after the Battle of Messines Ridge, Haig gave his objectives to his Army commanders: wearing out the enemy, securing the Belgian coast and connecting with the Dutch frontier by the capture of Passchendaele ridge, followed by an advance on Roulers and Operation Hush, an attack along the coast with an amphibious landing. If manpower and artillery were insufficient, only the first part of the plan might be fulfilled. On 30 April, Haig told Gough the Fifth Army commander, that he would lead the "Northern Operation" and the coastal force, although Cabinet approval for the offensive was not granted until 21 June.
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