During World War I, deception shifted from the tactical level to the strategic as modernized warfare and advances in technology increased the size and complexity of battlefield organizations. Several methods of deception were used by the Australian and New Zealand Army Corps (Anzac) during its withdrawal from Gallipoli in Turkey, which was completed on December 20, 1915. As early as mid-November, artillery and sniper activity went silent for periods of time, giving the impression that the Anzacs were preparing to remain in the defense with limited resupply of ammunition during the upcoming winter. To cover the removal of the last troops, "drip rifles" were prepared to fire about 20 minutes after they were set, with a water can leaking into a second can that was tied to a rifle trigger. When the second can was full, the weight caused the unmanned rifle to fire. The sporadic firing created by this ruse convinced the Turks that the Anzac troops were still manning their defenses. In addition, Anzac troops used dummy artillery and mannequins to further enhance the impression that soldiers remained in their positions. As a result of these deceptive measures, both the main body of Anzac troops and the rear guard retreated unmolested. Given the failure of the Gallipoli effort from the Anzac perspective, the evacuation was considered the most successful part of the entire campaign.