 However, with great investment of manpower and material, the Germans could be eventually defeated by the British and the Portuguese Army.A battle took place at Negomano on November 25, 1917 between the Germans and the Portuguese during World War I.In the river valley and the Nissa Wild Life Preserve enclosed within it, German Army supported by Askaris, under the command of General Paul Erich von Lettow-Vorbeck, crossed the Ruvuma River at Negomano and entered the Portuguese held Mozambique in search of food for his troops.