Encounter spent the first six years of her career operating with the RN's Australia Squadron, before being transferred to the newly formed RAN. During World War I, the cruiser became the first ship of the RAN to fire in anger when she bombarded Toma Ridge. Encounter operated in the New Guinea, Fiji-Samoa, and Malaya areas until 1916, when she returned to Australian waters. The ship spent the rest of the war patrolling and escorting convoys around Australia and into the Indian Ocean. In 1919, Encounter was sent to evacuate the Administrator of the Northern Territory and his family following the Darwin Rebellion.