the site of the 1780 powder magazine, which now provided the guardhouse's basement. The elaborate defences were meant to appear threatening to ships sailing into Sydney Harbour. In that same year sandstone blocks were quarried on site at Dawes Point Park for the construction of the fort. The fort was expanded substantially in 1819. Further buildings were constructed in the 1850s and at the end of the century. The site had also been used as a cemetery for prisoners executed at Old Sydney Gaol (1797-). The Aroostook War, a confrontation in 1838–1839 between the United States and the United Kingdom over the international boundary between the British colony of New Brunswick and the US state of Maine, raised concerns over the harbour's defenses. The arrival of two American sloops during the night, however peaceful, highlighted the colony's vulnerability. 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. Colonel George Barney was given the task renovating Sydney's fortifications and an extension of Dawes Point in 1860. Sydney's Harbour defences had been relocated to the entrance of Port Jackson by the end of the 19th century, thus rendering Dawes Point obsolete. The battery was then used to store the Commandant of the Australian Military from 1901 and 1903. Most of the fort was demolished in 1925 to make way for the construction of the Sydney Harbour Bridge. In 1932 the remaining buildings that served as a headquarters for Dorman and Long, the British company responsible for the construction of the Sydney Harbour Bridge were demolished and the whole area landscaped and set aside for public use. In 1995 archaeological investigations were carried out at the Battery site, and the findings were incorporated into a new interpretive park which was opened to the public in 2001. The park was named "Dawes Point|Tarra" acknowledging the Cadigal name for the area. Description The archaeological remains