The Russian success in repulsing an Anglo-French force in the Siege of Petropavlovsk, in the northern Pacific during the Crimean War (1854–56), raised concerns that the Russian Pacific Fleet would attack Sydney. At the time New South Wales was undergoing an economic boom following the discovery of gold. The colonial government enlarged Fort Macquarie and Dawes Point, constructed further fortifications at Kirribilli and Mrs Macquarie's Chair, and finished Fort Denison. Dawes Point received additional subterranean powder magazines and the Royal Artillery provided a garrison. Dawes Point Battery also became the command post for the fortifications around the inner harbor.