Question: The 1916 Australian plebiscite was held to conscript young Australian men for overseas service at the desire of the head of government whose office exists only through longstanding political convention and what?
Sentence (from "12th Brigade (Australia)"): Formed in 1916 as part of the all volunteer First Australian Imperial Force that was raised for overseas service during the First World War, the brigade was part of the 4th Division and fought on the Western Front until the end of the war in November 1918.
Relevant evidence: No