Haig believed that the war could only be won on the Western Front. This caused friction with Lloyd George, secretary of state for war and prime minister from December 1916 who disagreed with this strategy, supported alternative schemes and intrigued against Haig. The great German attacks of the spring of 1918 almost broke the British army, but inspired the creation of a single command of allied forces on the Western Front under the French commander Ferdinand Foch, strongly supported by Haig. Between August and November 1918 the Allied forces under Haig's command achieved a series of victories against the German army which resulted in the end of the war.
The conduct of war went through a profound revolution between 1914 and 1918. The British army, like all other armies, began the war using outdated tactics. These were progressively replaced by cutting-edge methods incorporating the latest technology, including artillery, air power, machine-guns, gas, and tanks. By 1918 Haig's forces had evolved a war-winning weapons-system that enabled them to defeat the German Army in battles such as at Amiens in August that year. As for casualties, win or lose, Western Front battles were costly in human life. A French commander, General Mangin, rightly remarked, 'whatever you do, you lose a lot of men'.