At the outbreak of World War I in August 1914, the governors of British East Africa (as the Protectorate was generally known) and German East Africa agreed a truce in an attempt to keep the young colonies out of direct hostilities. 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 Northern Rhodesia (today Zambia) fourteen days after the Armistice was signed in 1918.