on 23 July, following the allied victory at the Battle of Soissons. The plan called for reducing the Saint-Mihiel salient (which would later see combat in the Battle of Saint-Mihiel) and freeing the railway lines that ran through Amiens from German shellfire. The commander of the British Expeditionary Force, Field Marshal Sir Douglas Haig, already had plans in place for an attack near Amiens. When the British retreat had ended in April, the headquarters of the British Fourth Army under General Sir Henry Rawlinson had taken over the front astride the Somme. Its left hand corps was the British III Corps under Lieutenant General Richard Butler, while the Australian Corps under Lieutenant General John Monash held the right flank and linked up with French armies to the south. On 30 May, all the Australian infantry divisions were united under the corps HQ, for the first time on the Western Front. The Australians had mounted a number of local counter-attacks which both revealed the suitability of the open and firm terrain south of the Somme for a larger offensive, and established and refined the methods which were to be used. Rawlinson had submitted Monash's proposals to Haig in July and Haig had forwarded them to Foch. At a meeting on 24 July, Foch agreed to the plan but insisted that the French First Army, which held the front to the south of the British Fourth Army, should participate. Rawlinson opposed this as his and Monash's plans depended on the large-scale use of tanks (now finally available in large numbers) to achieve surprise, by avoiding a preliminary bombardment. The French First Army lacked tanks and would be forced to bombard the German positions before the infantry advance began, thus removing the element of surprise. Eventually, it was agreed that the French would participate, but not launch their attack until 45 minutes after the Fourth Army. It was also agreed to advance the proposed date of the attack from 10 to 8 August, to strike the Germans before they had completed their withdrawal from the Marne salient. Rawlinson had already finalised his plans in discussion with his Corps commanders (Butler, Monash, Sir Arthur Currie of the Canadian Corps and Lieutenant General Charles Kavanagh of the Cavalry Corps) on 21 July. For the first time, the Australians would attack side by side with the Canadian Corps. Both had a reputation for aggressive and innovative