Frederick Warren Muir, a law student from Unanderra, enlisted with the Australian Imperial Force at Randwick on 22 August 1914. He had brief military experience, having spent two-and-a-half years as a lieutenant in the cadets. Muir was assigned to the 1st Infantry Battalion and departed Sydney for Egypt aboard HMAT Afric on 18 October 1914.

After training at Egypt, Muir left with the 1st Battalion for the Dardanelles and participated in the landing on 25 April 1915. He wrote home to his mother almost every week from the trenches, describing in detail his experiences at the front line. His letters were published in the South Coast Times, a local paper in Wollongong.

In late November 1915, Muir was badly wounded and taken to the Hospital Ship Glenart Castle, just off the coast of the peninsula. Unfortunately, on 28 November he succumbed to his wounds and was buried at sea. Frederick Muir is commemorated on the Lone Pine Memorial, Turkey.