How We Fought the Emden is a 1915 Australian silent documentary film from cinematographer Charles Cusden about the Battle of Cocos during World War I, where the Australian ship Sydney sunk the Emden.

[4] The documentary includes pictures of the Emden and her officers prior to the engagement, the Sydney, her commander (Captain Glossop), officers and crew, the wireless station, the operator who sent the message that brought out the Sydney.

[5] In March 1915, members of the Millions Club in Sydney formed a Cocos Island Syndicate and organised an expedition to make a film about the defeat of the Emden during the Battle of Cocos.

[11] The film screened on a program of war pictures in Adelaide in 1916 as How We Fought the Emden.

[12] Footage from the movie was later incorporated into the films How We Beat the Emden (1915) and For the Honour of Australia (1916).