All of the people of Joshua's time joined the members of their families who had already died. Then those who were born after them grew up. They didn't know the Lord. They didn't know what he had done for Israel.
And all that generation was gathered to their fathers; and other men of Israel rose up, that knew not the Lord, and the works which he had done with Israel. (And all that generation died; and other men rose up, who did not know the Lord, and the works which he had done for Israel.)