After he went out to support T. J. Ryan for a referendum in this decade, a Prime Minister of one country unsuccessfully tried to get a protester arrested after he was struck by an egg. A declaration of jihad from the Ottoman Empire inspired two Pashto cameleers to commit a mass shooting during this decade’s Battle of Broken Hill. William Birdwood commanded troops during a campaign in this decade that began with a landing at Cape Helles. Ian Hamilton was (10[1])criticized for his leadership during that campaign in that decade that saw extensive fighting on Scimitar Hill. That campaign in this decade is commemorated every year on ANZAC Day. For 10 points, during what decade did the Australian Army participate in World War I? ■END■