The 1st Battalion, part of the 1st (Guards) Brigade of the 1st Division, was part of the British Expeditionary Force which arrived in France in 1914. The Battalion took part in the Battle of Mons in August 1914, the First Battle of the Marne in September 1914 and the Battle of the Aisne also in September 1914. The 1st and 2nd Battalions then took part in the First Battle of Ypres in November 1914, the Battle of Aubers Ridge in May 1915 and the Battle of Loos in September 1915. In July 1916 the Scots Guards took part in the first Battle of the Somme and in July 1917, the regiment began its involvement in the Battle of Passchendaele. In March 1918 they fought at the second Battle of the Somme and in Autumn the regiment took part in the final battles of the war on the Western Front.