This article explores the work and influence of Anglo-Catholicism in the Australian Imperial Force (AIF) during the Great War, based on reading the wartime correspondence of key AIF Anglo-Catholics, especially that of Canon David Garland and Chaplain William Maitland Woods. Anglo-Catholics were enthusiastic in support of the war, but simultaneously used it to promote Anglo-Catholicism, and combat what they perceived to be the errors of non Anglo-Catholic Anglicanism and the various Protestant groups, opening what might be considered a second front against these religions.