At the outbreak of war the Royal Australian Navy (RAN) came under the control of the British Admiralty. Its first task was to protect Australia’s ports, shipping, and trade routes. The Australian Naval and Military Expeditionary Force (AN&MEF) was quickly raised to seize German New Guinea and the New Britain Archipelago. On 11 September 1914 the force landed at Blanche Bay, Rabaul. When they encountered resistance from the German forces, six Australians were killed and four wounded – Australia’s first casualties of the war.
After the seizure of New Guinea, the RAN began the vital role of convoy escort. The first convoy of Australian and New Zealand troops departed from Albany, Western Australia, on 1 November 1914. Just over a week later, the convoy intercepted a message between the German raider SMS Emden and its collier. HMAS Sydney left the convoy and engaged the Emden in a brief but bloody action that left Emden beached on a coral reef.
HMAS Sydney spent the remainder of the war patrolling the Pacific off the coast of the Americas, and later the Atlantic.