against farmers, settlers, missionaries, planters, villages, indigenous people and peasants. Known as the Maji-Maji war with the main brunt borne by the Ngoni people, this was a merciless rebellion and by far the bloodiest in Tanganyika. World War I Before the outbreak of the war, German East Africa had been prepared to resist any attack that could be made without extensive preparation. For the first year of hostilities, the Germans were strong enough to conduct offensive operations in their neighbours' territories by, for example, repeatedly attacking railways in British East Africa. The strength of German forces at the beginning of the war is uncertain. Lieutenant-General Jan Smuts, the commander of British forces in east Africa beginning in 1916, estimated them at 2,000 Germans and 16,000 Askaris. The white adult male population in 1913 numbered over 3,500 (exclusive of the German garrison). In addition, the indigenous population of over 7,000,000 formed a reservoir of manpower from which a force might be drawn, limited only by the supply of German officers and equipment. "There is no reason to doubt that the Germans made the best of this material during the ... nearly eighteen months which separated the outbreak of war from the invasion in force of their territory." The geography of German East Africa also was a severe impediment to British and allied forces. The coastline offered few suitable points for landing and was backed by unhealthy swamps. The line of lakes and mountains to the west proved to be impenetrable. Belgian forces from the Belgian Congo had to be moved through Uganda. On the south, the Ruvuma River was fordable only its upper reaches. In the north, only one practicable pass about five miles wide existed between the Pare Mountains and Mount Kilimanjaro, and here the German forces had been digging in for eighteen months. Germany commenced hostilities in 1914 by unsuccessfully attacking from the town of Tanga. The British then attacked the town in November 1914 but were thwarted by General Paul von Lettow-Vorbeck's forces at the Battle of Tanga. The British Royal Navy occupied Mafia Island in January 1915. However, the "attack on Tanga and the numerous smaller engagements that followed [showed] the strength ... of [German forces] and made it evident that a powerful force must be organized before the conquest of [German East Africa] could be ... undertaken. Such an enterprise had ... to await more favourable