Kenya served as a base for the British in the First World War as part of their effort to capture the German colonies to the south, which were initially frustrated. At the outbreak of war in August 1914, the governors of British East Africa (as the Protectorate was generally known) and German East Africa agreed to a truce in an attempt to keep the young colonies out of direct hostilities. However, Lt. Col Paul von Lettow-Vorbeck took command of the German military forces, determined to tie down as many British resources as possible. Completely cut off from Germany, von Lettow conducted an effective guerrilla warfare campaign, living off the land, capturing British supplies, and remaining undefeated. He eventually surrendered in Zambia eleven days after the Armistice was signed in 1918. To chase von Lettow-Vorbeck, the British deployed Indian Army troops from India and then needed large numbers of porters to overcome the formidable logistics of transporting supplies far into the interior by foot. The Carrier Corps was formed and ultimately mobilised over 400,000 Africans, contributing to their long-term politicisation.