On 29 November 1917, an egg was thrown at the Australian Prime Minister Billy Hughes at the Warwick railway station, Queensland, during his campaign for the 1917 plebiscite on conscription.

[1] Pressured by British leaders for increased Australian participation in the war effort, Labor Prime Minister Billy Hughes announced his intention to hold a national referendum on compulsory military conscription in October 1916.

After joining with the conservative Opposition to form a nationalist government in February 1917, Hughes resolved to hold a second conscription referendum the following December.

[3] Realising his weapon was not available, Hughes ordered the local police officer, Sergeant Kenny, to arrest Brosnan for a breach of Commonwealth law but the policeman said "you have no jurisdiction".

[2][9] This Wikipedia article contains text from "Number 120 – Telegram from Prime Minister Hughes to the Commissioner for Police regarding being egged (later referred to as the “Warwick Egg Incident”)" published by the Queensland State Archives under CC-BY 3.0 AU licence (last updated 5 March 2012, accessed on 18 October 2015, archived on 18 October 2015).