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戦争中の秘密の地下トンネル網と破壊行為
- Twelve subways were excavated during the war, connecting reserve lines to front lines and providing a quick and secure route for soldiers.
- The Germans also dug tunnels on the Vimy front, creating covered routes to the front line and protecting personnel, equipment, and ammunition.
- Both the Germans and the British conducted mining and counter-mining operations to gain strategic advantages on the battlefield.
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Total British losses from January to March 1917 in France were given as 67,217, French losses given were 108,000 and German losses were 65,381. The first attack of the Nivelle Offensive by the British First and Third armies came at Arras, north of the Hindenburg Line on 9 April and inflicted a substantial defeat on the German 6th Army, which occupied obsolete defences on forward slopes. Vimy Ridge was captured and further south, the greatest depth of advance since trench-warfare began was achieved, surpassing the success of the French Sixth Army on 1 July 1916. German reinforcements were able to stabilise the front line, using both of the defensive methods endorsed in the new German training manual and the British continued the offensive, despite the difficulties of ground and German defensive tactics, in support of the French offensives further south and then to keep German troops in the area while the Messines Ridge attack was being prepared. German casualties were c. 85,000, against British losses of 117,066 for the Third and First armies.
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The division ascribed the success to the excellence of their training, an excellent creeping barrage and smoke shell, which had thickened the mist and blinded the German defenders; gas shell barrages on the German reinforcement routes had depressed German morale. The 51st Division further north, had the same task on Poelcappelle spur. The division advanced with one brigade on a 1,400 yd (1,300 m) front. The Germans in the Wilhemstellung were ready for them and fought until they were almost annihilated, in new machine-gun nests that they had dug in front of their front line, which had avoided the worst of the artillery bombardment. The division reached the final objective in sight of Poelcappelle village. By these advances, XVIII Corps got observation of Poelcappelle and up the Lekkerboterbeek and Lauterbeek valleys, the capture of which allowed British artillery to move forward of the Steenbeek. The 20th Division on the right of XIV Corps, had to form the northern defensive flank of the offensive, on a front of 1,400 yd (1,300 m) from Poelcappelle spur to the Ypres–Staden railway. Two brigades attacked with two battalions each. The German Wilhemstellung, here known as Eagle trench, was held as determinedly as that part in the 51st Division sector (Pheasant Trench) despite a bombardment from Livens Projectors (which fell behind the German trench and illuminated the British infantry as they advanced). By the end of the day the division was still short of the first objective, except on the left next to the railway. The British offensive had captured most of the German outpost zones, to a depth of about 1,500 yd (1,400 m). As the ground was captured it was prepared for defence, in anticipation of counter-attacks by the German Eingreifdivisionen. Captured German machine-gun nests and strong points were garrisoned and wired with German barbed wire found in the area. The final objective became the outpost zone and the second objective the main line of resistance, a chain of irregular posts using shell-holes concealed by folds of the ground and reverse slopes, avoiding trenches which attracted German shellfire.
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The British tunnellers had gained an advantage over the German miners by the Autumn of 1916, which virtually ended the German underground threat. The British turned to digging 12 subways about 25 ft (7.6 m) down, to the front line, the longest tunnel being 1,883 yd (1,722 m) long of the 10,500 yd (9,600 m) dug. In one sector, four Tunnelling companies of 500 men each, worked around-the-clock in 18-hour shifts for two months to dig 12 mi (20 km) of subways for foot traffic, tramways with rails for hand-drawn trolleys and a light railway system. Most tunnels were lit by electricity, accommodated telephone cables and some had trams and water supplies. Caverns were dug into the sides for brigade and battalion HQs, first aid posts and store-rooms. The subways were found to be a most efficient way to relieve troops in the line, form up for the attack and then to evacuate wounded. Some of the tunnels were continued into Russian saps with exits in mine craters in no man's land and new mines were laid. Galleries were dug to be opened after the attack for communication or cable trenches, the work being done by the 172nd, 176th, 182nd and 185th Tunnelling companies (Lieutenant-Colonel G. C. Williams, Controller of Mines First Army).
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On 8 July, German counter-barrage on the lines of the 36th Brigade west of Ovillers, caused many casualties but at 8:30 a.m., the British attacked behind a creeping barrage and quickly took the first three German trenches. Many prisoners were taken in the German dug-outs, where they had been surprised by the speed of the British advance. The three German battalions lost 1,400 casualties and withdrew to the second German trench behind outposts; Infantry Regiment 186, II Battalion, Guard Fusiliers and Recruit Battalion 180, had many casualties and withdrew into the middle of the village.
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Eighty dead German soldiers were counted later, in and around the British front trenches. By 7:30 a.m., the German raid was over and during the night, two British battalions were relieved; the rest of 28 April was quiet, except for a raid by the 1st Division, at the "Double Crassier" near Loos. At 3:45 a.m., a German artillery bombardment and gas discharge began on the 16th Division front but the expected attack did not occur. German troops were seen massing in the trenches near Hulluch at 4:10 a.m. and small numbers advanced towards the British trenches, where they were engaged by small-arms fire. The German gas then reversed course and German infantry on a 0.5-mile (0.80 km) front ran to the rear through the gas and British artillery-fire, leaving about 120 dead on the front of the 16th Division.
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German bombardments continued during the night of 4/5 March, before an attack on the British right flank, which captured a trench block and about 100 yards (91 m) of Fritz Trench to the north, before a local counter-attack recovered the recaptured ground. German artillery-fire continued all day and at 7:30 p.m., German infantry seen massing on the right flank, were dispersed by SOS artillery and machine-gun barrages before they could attack; German bombardments continued on 6 March, before slowly diminishing. The operation cost the British 1,137 casualties, 217 German prisoners and seven machine-guns were captured and "exceedingly heavy" German casualties inflicted, according to surveys of the vicinity, after the German withdrawal to the Hindenburg Line (Siegfriedstellung).
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In the Second Action of Givenchy (15–16 June), IV Corps of the British First Army, attacked north-west of La Bassée with the 7th, 51st and Canadian divisions after a 60-hour bombardment, in which an attempt to alleviate an acute ammunition shortage was made by relying on artillery observation and tactical reconnaissance by reinforced RFC squadrons. No covering fire was available for the attack and the German defenders were seen to have manned the front line before the advance began. The Germans opened massed small-arms fire but were not able to prevent the British from entering the German front trench, where a bombing fight began. German infantry were well-supplied with hand grenades but the British were isolated by cross-fire along no man's land and were pushed back as they ran out of ammunition, the last troops retiring at 4:00 a.m. A new attack on 15 June, using all of the artillery ammunition left was delayed by thick mist and the difficulty in reorganising the infantry but went ahead at 4:45 p.m. and took the German front line. The advance was stopped until the line was consolidated but the British and Canadian troops who had not been pinned down in their own trenches were forced back by a German counter-attack at 8:00 p.m. after which further attacks were cancelled. The British Second Army conducted the First Attack on Bellewaarde on 16 June with the 3rd Division, which took the German first line easily at 4:15 a.m. The second and third waves rushed forward and ran into the British bombardment, which was not seen by the gunners due to the amount of mist and smoke created by the bombardment. The British still managed to reach the German second line and three German counter-attacks had only managed to push the 3rd Division back to the first line, when the British ran short of ammunition. Support from a brigade of the 14th Division to exploit the success, was delayed by German artillery-fire and fewer than two battalions of the 3rd Division managed to advance at 3:30 p.m., up a flat open slope and were repulsed with many casualties. At 6:00 p.m. the German front trench from Menin road to Railway Wood was consolidated, which was short of Bellewaarde ridge and the German observation posts along it. Joffre criticised British "inaction", which enabled the Germans to concentrate resources against the Tenth Army. The British First Army attacked in the Battle of Aubers Ridge, in support of the French offensive further south. North of La Bassée Canal, British artillery fire increased against the II Bavarian and XIX Saxon corps and at 6:00 a.m., an attack began against the 6th Bavarian Reserve Division and broke into the first line north of Fromelles. Fighting continued into the evening, when the trenches were recaptured. More British attacks occurred at Richbourg l'Avoué and at times penetrated to the German first line before being repulsed. Little ground was captured, none was held against German counter-attacks and German troops were soon sent south to reinforce the Arras front.
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It was put out that the gas helmets of the division were of inferior manufacture, to allay doubts as to the effectiveness of the helmet. Production of the Small Box Respirator, which had worked well during the attack, was accelerated.By the end of the Battle of Loos in 1915, the British armies in France held ground which was usually inferior to the German positions opposite, which were on higher ground, which was drier and had good observation over the British lines and rear areas. In early 1916 the British took over more of the Western Front, to allow the French Tenth Army to move south to Verdun, ground which was just as tactically disadvantageous.
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The Battle Zone was also usually organised in three defensive systems, front, intermediate and rear, connected by communication trenches and switch lines, with the defenders concentrated in centres of resistance rather than in continuous lines. About 36 of the 110 infantry and pioneer battalions of the Fifth Army held the Forward Zone. Artillery, trench mortars and machine-guns were also arranged in depth, in positions chosen to allow counter-battery fire, harassing fire on transport routes, fire on assembly trenches and to be able to fire barrages along the front of the British positions at the first sign of attack. Artillery positions were also chosen to offer cover and concealment, with alternative positions on the flanks and to the rear. About 2⁄3 of the artillery was in the Battle Zone, with a few guns further forward and some batteries were concealed and forbidden to fire before the German offensive began. The Germans chose to attack the sector around St. Quentin taken over by the British from February–April 1917, following the German withdrawal to the Hindenburg Line. Germany had begun construction of the Siegfried Stellung (Hindenburg Line) in September 1916, during the battle of the Somme. It stretched over 500 km (300 mi) from the Channel to the Moselle River and was built by Belgian and Russian prisoners of war. The strongest section was the salient at St. Quentin between Arras and Soissons. The line was 1.5 km (1 mi) deep with barbed wire in zig-zag lines of 15 m (50 ft), protecting three lines of trenches, interconnecting tunnels and strong points. In the rear were deep underground bunkers known as stollen (galleries) and artillery was hidden on reverse slopes. The Germans withdrew to this line in an operation codenamed Alberich over five weeks, during which time German High Command ordered a scorched earth policy. The ground abandoned in the retreat was laid waste, wells were poisoned, booby-traps laid and most towns and villages were destroyed. The attacking armies were spread along a 69-kilometre (43 mi) front between Arras, St. Quentin and La Fère. Ludendorff had assembled a force of 74 divisions, 6,600 guns, 3,500 mortars and 326 fighter aircraft, divided between the 17th Army (Otto von Below), 2nd Army (Georg von der Marwitz) of Heeresgruppe Kronprinz Rupprecht (Army Group Rupprecht of Bavaria) and the 18th Army (General Oskar von Hutier), part of Heeresgruppe Deutscher Kronprinz (Army Group German Crown Prince) and the 7th Army.
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On Zero-Day, 9 April, over 80 percent of German heavy guns in the sector were neutralised (that is, "unable to bring effective fire to bear, the crews being disabled or driven off") by counter-battery fire. Gas shells were also used against the draught horses of the batteries and to disrupt ammunition supply columns. The preliminary bombardment of Vimy Ridge started on 20 March; and the bombardment of the rest of the sector on 4 April. Limited to a front of only 24 miles (39 km), the bombardment used 2,689,000 shells, over a million more than had been used on the Somme. German casualties were not heavy but the men became exhausted by the endless task of keeping open dug-out entrances and demoralised by the absence of rations caused by the difficulties of preparing and moving hot food under bombardment. Some went without food altogether for two or three consecutive days. By the eve of battle, the front-line trenches had ceased to exist and their barbed wire defences were blown to pieces. The official history of the 2nd Bavarian Reserve Regiment describes the front line as "consisting no longer of trenches but of advanced nests of men scattered about". The 262nd Reserve Regiment history writes that its trench system was "lost in a crater field".
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