When war broke out in 1914 Australia had been a federated nation for only 13 years, and the new federal government was eager to establish its reputation among the nations of the world. When Britain declared war in August 1914 Australia was automatically placed on the side of the Commonwealth. In 1915 Australian and New Zealand soldiers formed part of the expedition that set out to capture the Gallipoli peninsula in order to open the Dardanelles to the allied navies. The ultimate objective was to capture Constantinople (now Istanbul), the capital of the Ottoman Empire, an ally of Germany.