In February 1915, she was assigned as leader of the 10th Destroyer Flotilla of the Harwich Force, guarding the eastern approaches to the English Channel. While a member of this unit, the cruiser was fitted with an aircraft flying-off platform over the forecastle allowing "Aurora" to launch a French monoplane. This was installed to counter the Zeppelin threat that harassed the Harwich Force. The design was ultimately unsuccessful as the aircraft could not intercept the Zeppelin fast enough and was uninstalled in August. The cruiser left the 10th Destroyer Flotilla in June and joined the 5th Light Cruiser Squadron, which "Aurora" remained with until the end of the war. That year, the cruiser also had her 3-pounder gun replaced with a QF 20 cwt gun placed on the centreline aft.