Horace Brinsmead joined the First Australian Imperial Force, which formed on August 15, 1914 after Britain's declaration of War on Germany, and served and fought on Gallipoli and at Pozieres.
When the First World War started in 1914, he joined the First Australian Imperial Force. It was formed as the Australian Imperial Force (the AIF) on 15 August 1914, following Britain's declaration of war on Germany, initially with a strength of one infantry division and one light horse brigade. He served and fought on Gallipoli and at Pozieres. 
