Achior explains the Israelite history in Egypt (Jdt 5:10-5:16)

“When a famine spread over the land of Canaan, they went down to Egypt. They lived there as long as they had food. They became so great a multitude that their race could not be counted. So the king of Egypt became hostile to them. He exploited them. He forced them to make bricks. They cried out to their God. Their God afflicted the whole land of Egypt with incurable plagues. So the Egyptians drove them out of their sight. Then God dried up the Red Sea before them. He led them by the way of Sinai and Kadesh-barnea. They drove out all the people of the wilderness. They took up residence in the land of the Amorites. By their might they destroyed all the inhabitants of Heshbon. Then they crossed over the Jordan and took possession of all the hill country. They drove out before them the Canaanites, the Perizzites, the Jebusites, the Shechemites, and all the Gergesites. They have lived there a long time.”

Achior tells the story of how these Israelites went to Egypt and came back.   Once again, there is no mention of a specific leader like Joseph, Moses, or Joshua. The Israelites were in a famine and went to Egypt, where they became a great race. However, the king of Egypt turned on them and forced them to make bricks. In their struggle, they cried out to their God, who then inflicted the Egyptians with plagues. Then the Egyptians drove them out as their God dried up the Red Sea. They even drove out the people in the wilderness. They took the land of the Amorites around Heshbon. Then they crossed the Jordan and defeated the traditional enemies, the Canaanites, the Perizzites, the Jebusites, the Shechemites, and all the Gergesites. This is the Exodus story with an emphasis on how they got to Egypt and who they wiped out along the way. Apparently, they had lived in Canaan a long time.