Also formed at the Wiltshire Regiment's depot in Devizes in September 1914, the 7th (Service) Battalion was part of the Third New Army (or K3) of Kitchener's scheme. Soon after formation, the battalion became part of the 79th Brigade, assigned to the 26th Division. In September 1915, the division was transferred to France before being reassigned to the Mediterranean as part of the British forces fighting in Salonika. As part of the division, the battalion was engaged in the Battle of Horseshoe Hill in 1916, and First and Second Battles of Dorian in 1916 and 1917.