Moses began with the departure of the Israelites from Egypt and he reviewed the events leading to God’s refusal to allow their fathers to enter into Canaan. He mentioned the system of government that they had. God was their Supreme Leader with Moses being His spokesman. Judges were appointed to assist Moses in his work. There were also various lesser leaders over smaller groups of the people. It was pointed out to the people how that their fathers had refused to believe that God would protect them and deliver the Promised Land to them.
As the Israelites began their march through the wilderness, God had helped them to defeat the people blocking their way. Near the end, there were however, two areas that they were forbidden to enter. Mount Seir had been given to Esau and his descendants many years earlier. Also, Ar had been given to the descendants of Lot. Sihon, king of Heshbon and Og, king of Bashan along with their people were defeated by the Israelites with the help of God. Those lands were given to the tribes of Reuben, Gad and the half tribe of Manasseh.
One may cringe somewhat in disbelief at the brutality of the Israelites as they completely destroyed men, women and children in their conquest. It should be remembered that they were wicked nations and God was using the children of Israel to inflict His wrath upon their disobedience.
Moses related to the Israelites how he had pled with God to allow him to cross into the Promised Land. God’s mind would not be changed. He said to Moses, “Enough of that! Speak no more to Me of this matter.”