Violent conflict on the Australian frontier between indigenous Australians and the colonists began only months after the First Fleet landed, lasting over a century. Convicts forced to work in the bush on the frontier were sometimes the victims of indigenous attacks, while convicts and ex-convicts also attacked indigenous people in some instances, such as the Myall Creek Massacre. In the Hawkesbury and Nepean Wars, a group of Irish convicts joined the Aboriginal coalition of Eora, Gandangara, Dharug and Tharawal nations in their fight against the colonists.