the georges head battery, also called the georges head military fortifications is a fort on the georges head, in the suburb of mosman in sydney, new south wales, australia. the georges head fort is one of many forts that were built on sydney harbour meant to defend the colony of new south wales, just encase another country tried to invade our country australia. the fort became the boss of all other forts in the 1890s organizing all of sydney's harbour forts.