The Book of Joshua is a sequel to the Pentateuch (the Torah). Moses died in the land of Moab, within site of the promised land. To Joshua, his successor, was left the mission of leading is leading Israel across the Jordan into Canaan.
The Greater part of the book describes the conquest if Canann and the division of the land amoung the tribes of Israel. After the fall of Jericho and Ai, and the capitulationn of Gibeon, in central Canaan, Joshua was confronted by two successive coalitions of Canannite states, one in the south with the King of Jerusalem at it's head, and the other in the north under Jabin of Hazor. Through divine assistance Joshua was able to conquer both south and north, and to apportion the land amoung the tribes. The Book of Joshua records the history of Israel from Joshua's appiontment as Moses' successor to his death at the age of 110.

From the New Improved Hertel blue ribbon edition King James study Bible