The entrance into the land was an extremely important event in the life of Israel. The writer marked it off in three major movements. Each one begins with a command of God to Joshua (3:7-8; 4:1-3; and 4:15-16) followed by the communication of the command to the people and then its execution. The way the narrator told the story seems designed to impress on the reader that it was Yahweh who was bringing His people miraculously into the land.
Before Israel entered the land of Canaan, God had been preparing for His people to take possession of it by sovereignly directing the political affairs of Egypt. Egypt had maintained control over Canaan for many years. However with the ascension of Pharaoh Amenhotep II (1417--1379 B.C.) to the throne, Egyptian interest in Canaanite affairs began to decline. Consequently some of the Canaanite kings asserted their independence from Egyptian control and began to increase their influence and to dominate their neighbors. In addition, foreigners besides the Israelites invaded portions of Canaan. Some of the victims of oppression wrote letters to Pharaoh asking for Egyptian assistance. They sent these letters to Amarna, the capital of Egypt at this time, and they are known today as the Amarna Letters. They wrote these documents in cuneiform script. Archaeologists discovered them at Amarna in A.D. 1887. They provide much valuable information on the political and military climate in Canaan during the period of Israel's conquests.69
"While Akhenaten [Amenhotep III, 1379-1361 B.C., the son and successor of Amenhotep II] spent his life preoccupied with religious reform, Egyptian prestige in Asia sank to a low ebb. As the Amarna Letters abundantly show, no effort was made by the court to answer the frantic appeals for help made by some princes who still professed loyalty to Egypt. The most common complaint in these letters is that unless Egypt would send troops urgently the land would fall into the hands of the Khapiru. Some historians are inclined to see in these Khapiru the Hebrews of the Bible who at this time were overrunning Palestine."70
When the Israelites began their conquest, the Canaanite city-states did not have the protection of Egypt or any other strong world power that they had enjoyed in the past.
