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In 1915 the German forces, except for those at Mora and Garua, withdrew to the mountains near the new capital of Jaunde. In the spring the German forces delayed or repulsed Allied attacks and a force under Captain von Crailsheim from Garua, conducted an offensive into Nigeria and fought the Battle of Gurin. General Frederick Hugh Cunliffe began the Second Battle of Garua in June, which was a British victory. Allied units in northern Kamerun were freed to push into the interior, where the Germans were defeated at the Battle of Ngaundere on 29 June. Cunliffe advanced south to Jaunde but was held up by heavy rains and his force joined the Siege of Mora. When the weather improved, Cunliffe moved further south, captured a German fort at the Battle of Banjo on 6 November and occupied several towns by the end of the year. In December, the forces of Cunliffe and Dobell made contact and made ready to conduct an assault on Jaunde. In this year most of Neukamerun had been fully occupied by Belgian and French troops, who also began to prepare for an attack on Jaunde.
German forces began to cross into the Spanish colony of Rio Muni on 23 December 1915 and with Allied forces pressing in on Jaunde from all sides, the German commander Carl Zimmermann ordered the remaining German units and civilians to escape into Rio Muni and by mid-February, c. 7,000 Schutztruppen and c. 7,000 civilians had reached Spanish territory.On 18 February the Siege of Mora ended with the surrender of the garrison. Most Kamerumians remained in Muni but the Germans eventually moved to Fernando Po and some were allowed by Spain to travel to the Netherlands to go home. Some Kamerunians including the paramount chief of the Beti people, moved to Madrid, where they lived as visiting nobility on German funds.