The Battle of Ngomano or Negomano was fought between Germany and Portugal during the East African Campaign of World War I. A force of Germans and Askaris under Paul Emil von Lettow-Vorbeck had recently won a costly victory against the British at the Battle of Mahiwa, in present-day Tanzania and ran very short of food and other supplies. As a consequence, the Germans invaded Portuguese East Africa to the south, both to supply themselves with captured Portuguese materiel and escape superior British forces to the north.