In 1810, the colony's garrison, which had until that time been provided by the New South Wales Corps, was relieved. They were subsequently replaced by a British regular infantry unit, the 73rd Regiment of Foot, which rotated duties between Sydney and Hobart. The following year, when Governor Lachlan Macquarie toured the Hobart Town settlement, he was alarmed at the poor state of defence, and the general disorganisation of the colony. Along with planning for a new grid of streets to be laid out, and new administrative and other buildings to be constructed, he commissioned the building of Anglesea Barracks, which opened by 1814. The same year, the 73rd was replaced by the 46th (South Devonshire) Regiment of Foot, who subsequently undertook a series of operations against bushrangers. By 1818, the Mulgrave Battery, consisting of six guns, had been built on Castray Esplanade, on the southern side of Battery Point upon the orders of Lieutenant Governor William Sorell. In 1824 the battery was expanded to include two 13-pounders and four 9-pounders; two other guns, 6-pounder brass pieces, were positioned in Angelsea Barracks.