Canada's Hundred Days

The allied command had developed an understanding that the Germans had learned to suspect and prepare for an attack when they found the Canadian Corps moved in and massed on a new sector of the front lines. British Prime Minister David Lloyd George reflected this attitude when he wrote in his memoirs: "Whenever the Germans found the Canadian Corps coming into the line they prepared for the worst."[8] A deception operation was devised to conceal and misrepresent the Canadians position in the front. A detachment from the Corps of two infantry battalions, a wireless unit and a casualty clearing station had been sent to the front near Ypres to bluff the Germans that the entire Corps was moving north to Flanders.[9] Meanwhile, the majority of the Canadian Corps was marched to Amiens in secret.[10] Allied commanders included the notice "Keep Your Mouth Shut" into orders issued to the men, and referred to the action as a "raid" rather than an "offensive".[11] To maintain secrecy, there was to be no pre-battle bombardment, only artillery fire immediately prior to the advance.[12] The plan instead depended on large-scale use of tanks to achieve surprise, by avoiding a preliminary bombardment, a tactic successfully employed at the Battle of Hamel.[13]

The battle began in dense fog at 4:20 am on 8 August 1918.[11][14] Under Rawlinson's Fourth Army, the British III Corps attacked north of the Somme, the Australian Corps to the south of the river in the centre of Fourth Army's front, and the Canadian Corps to the south of the Australians. The French 1st Army under General Debeney opened its preliminary bombardment at the same time, and began its advance 45 minutes later.[15] The operation was supported by more than 500 tanks, which helped to cut through the numerous barbed wire defences employed by the Germans.[16]

The first day of the attack, August 8, saw the attacking forces break through the German lines in dramatic fashion, with the Canadians pushing as far as 13 kilometres (8.1 mi) from their starting points. In many places the fog provided good cover for their advances in and through the furrows of the valley of the Luce river which ran through the centre of the Canadian's portion of the battlefield. The tanks were successful in this battle, as they attacked German rear positions, creating panic and confusion. The swift advance led to a rapidly spreading collapse in German morale that ultimately led Erich Ludendorff to dub it "the Black Day of the German Army" when he was told of the psychological impact on his men.[17]

Continuing to press the advantage gained on Day One, the advance continued for three more days but without the spectacular results of August 8, since the rapid advance outran the supporting artillery that could not be repositioned as quickly as the infantry advanced. By the 10th of August, the Germans had been forced to pull out of the salient that they had managed to occupy during Operation Michael in March, back towards the Hindenburg Line.[17] Left without an enemy to fight or a plan to pursue the retreat the Allied advances in the Amiens sector including those of the Canadians petered out by 13 August and the Amiens operation was halted.[12]

The Canadians remained on the scene at Amiens until 22 August, consolidating their gains and prepared to defend against counter-attack. On the 23rd they were summoned to pull out and go into the line east of Arras for an attack that was to commence three days later. There they were stationed in the villages of Fouquescourt, Maucourt, Chilly and Hallu from which they would attack eastward toward the Hindenburg Line.

At Amiens the four Canadian Divisions faced and defeated or put to flight ten full German Divisions and elements of five others that sat astride their boundaries with the Australians and French on either side of them. In the five earnest days of fighting between the 8th and 13 August the Canadian Corps captured 9,131 prisoners, 190 artillery pieces, and over 1,000 machine guns and trench mortars. The deepest extent of penetration from their jumping off points was approximately 14 miles or 22.5 kilometres, and in total the Canadians liberated an area of more than 67 square miles/173.5 square kilometres which contained 27 towns and villages.[18]

In Arras, the Canadians attacked eastward, smashing the outer defence lines near the powerful Drocourt-Quéant Line (the Wotan Stellung section of the Hindenburg line), along the Arras-Cambrai road. On September 2, 1918, the Canadian Corps smashed the Drocourt-Quéant line, and broke its main support position, taking 5,622 casualties, which brought the total losses of the Arras-Cambrai operation up to 11,423 casualties. After this, the Germans retreated across the Canal du Nord, which was almost completely flooded.

Canadian troops shelter in a ditch along the Arras-Cambrai road.

At the Battle of the Canal du Nord, following up the first breaking of the Hindenburg line, the Canadians used a complex manoeuvre to attack along the side of the canal through an unfinished dry section. The Canadians built bridges and crossed the canal at night, surprising the Germans with an attack in the morning. This proved the ability of Canadian engineers to construct new roads to cross the canal efficiently without the Germans noticing. The specialisation of troops and formally organised battalions of combat engineers was also effective as it allowed the soldiers to rest instead of working every day that they were not actively attacking.

The Canadians then broke the Hindenburg line a second time, this time during the Battle of Cambrai, which (along with the Australian, British and American break further south at the Battle of St. Quentin Canal) resulted in a collapse of German morale.

This collapse forced the German High Command to accept that the war had to be ended. The evidence of failing German morale also convinced many Allied commanders and political leaders that the war could be ended in 1918. (Previously, all efforts had been concentrated on building up forces to mount a decisive attack in 1919.)

As the war neared its end, the Canadian Corps pressed on towards Germany and the final phase of the war for the Canadians was known as the Pursuit to Mons. It was during these final thirty-two days of the war that the Canadians engaged the retreating Germans over about seventy kilometres in a running series of battles at Denain and Valenciennes in France and finally Mons in Belgium where they pushed the Germans out of the town on November 10–11.[19] Mons was, coincidentally, where the British had engaged the German armies for the first time in battle in the Great War on August 23, 1914. As such, Mons is considered by some to be the place where the war both began and ended for the British Empire.

Some criticism was leveled at Canadian Corps commander Arthur Currie by Sam Hughes and others for needlessly wasting lives to capture Mons once it was known that the armistice was imminent. They claimed the soldiers who were killed and wounded in taking Mons were sacrificed for not a strategic, but a symbolic objective. The allegations even appeared in print in newspapers run by Hughes' family which led to Currie launching and winning a libel lawsuit against Hughes' son Garnet and others after the war.[20]