Canadian Divisions quickly captured their first objectives. The 4th Canadian Division encountered a great deal of trouble during its advance and was unable to complete its first objective until some hours later. The 1st, 2nd, and 3rd Canadian Divisions captured their second objective by approximately 7:30 am. The failure of the 4th Canadian Division to capture the top of the ridge delayed further advances and forced the 3rd Canadian Division to expend resources establishing a defensive line to its north. Reserve units from the 4th Canadian Division renewed the attack on the German positions on the top of the ridge and eventually forced the German troops holding the southwestern portion of Hill 145 to withdraw. On the morning of 10 April, Canadian Corps commander Lieutenant-General Julian Byng moved up three fresh brigades to support the continued advance. The fresh units leapfrogged units already in place and captured the third objective line, including Hill 135 and the town of Thélus, by 11:00 am. By 2:00 pm both the 1st and 2nd Canadian Divisions reported capturing their final objectives. By this point the "Pimple", a heavily defended knoll west of the town of Givenchy-en-Gohelle, was the only German position remaining on Vimy Ridge. On 12 April, the 10th Canadian Brigade attacked and quickly overcame the hastily entrenched German troops, with the support of artillery and the 24th British Division. By nightfall on 12 April, the Canadian Corps was in firm control of the ridge. The Canadian Corps suffered 10,602 casualties: 3,598 killed and 7,004 wounded. The German Sixth Army suffered an unknown number of casualties, and around 4,000 men became prisoners of war. Although the battle is not generally considered Canada's greatest military feat of arms, the image of national unity and achievement imbued the battle with considerable national significance for Canada. According to Pierce, "the historical reality of the battle has been reworked and reinterpreted in a conscious attempt to give purpose and meaning to an event that came to symbolize Canada's coming of age as a nation." The idea that Canada's identity and nationhood were born out of the battle is an opinion that is widely held in military and general histories of Canada. History Selection In 1920, the Government of Canada announced that the Imperial War Graves Commission had awarded Canada eight sites—five in France and three in Belgium—on which to erect memorials. Each site represented a significant Canadian