With the alienation from their lands due to settlers claiming land and fencing it off, Aboriginal people lost access to important seasonal foods, they did not understand or accept private ownership of their lands, which led to spearing of stock and digging in food gardens. Reprisals led to a cycle of increased violence on both sides. The first attempted Aboriginal massacre was the "Battle for Perth" when there was an attempt to surround and capture Aboriginal people who had retreated into Lake Monger. The area was cordoned, but the hunted people escaped. Once Lake Monger was settled by the Monger family, Yellagonga moved to Lake Joondalup. In 1834 this Wanneroo area was explored by John Butler, and in 1838 by George Grey. With the lands seized for settlement in 1843, Yellagonga was reduced to begging for survival, and shortly thereafter he accidentally drowned.