 Complete the following phrase:  In 1916, the Headquarters of the 4th British army, led by General Rawlinson, was set up in the castle of Querrieu. On 1 July 1916, General Haig, commander of the British Forces in France, is poised to attack. After a heavy artillery barrage the British troops advance from their trenches toward the German line. However, the barrage failed to destroy the distant German artillery, which then opened return fire on the advancing troops. Thus began the British infantrys 