In September 1914, the Germans had mined the Kamerun or Wouri estuary and scuttled naval vessels there to protect Douala, the colony's largest city and commercial centre. British and French naval vessels bombarded towns on the coast and by late September had cleared mines and conducted amphibious landings in order to isolate Douala. On 27 September, the city surrendered to Brigadier General Charles Macpherson Dobell, commander of the combined Allied force. The occupation of the entire coast soon followed as the French captured more of the territories to the south-east in an amphibious operation at the Battle of Ukoko.
