After completing training, the 3rd Brigade was designated as the covering force for the landing at Anzac Cove, Gallipoli, on 25 April 1915, and so was the first brigade ashore about 4:30am. By 9:00am, Wilder was performing the role of battalion adjutant, assisting the acting commanding officer to organise and direct the unit. The day after the landing, Wilder's actions resulted in the award of the Distinguished Conduct Medal, the second highest award for acts of gallantry by other ranks. The citation read: