 For much of the war, the opposing armies on the Western Front were at a stalemate, with a continuous line of trenches stretching from the Belgian coast to the Swiss border. The Allied objective from early 1915 was to break through the German defences into the open ground beyond and engage the numerically inferior German Army in a war of movement. The British attack at Arras was part of the French Nivelle Offensive, the main part of which was to take place 50 miles (80 km) to the south. The aim of this combined operation was to end the war in forty-eight hours. At Arras the British were to divert German troops from the French front and to take the German-held high ground that dominated the plain of Douai.
