Georges Head was near the entrance to Sydney Harbour and was meant to attack baddies (foreign ships that are not friendlies) before they could get into the harbour. The fort was on a very good spot and was positioned high above sea level with clear views to the entrance of Port Jackson (Sydney Harbour/Sydney Heads). Other forts were also on Middle Head, South Head, Shark Point and Bradleys Head, but none were ever used for fighting ships or troops from other countrys.