The book of Judges supports this decision in another way, by the words of Jephthah, who was one of the judges of the people.
When the Ammonites, who lived on the other side of the river Jordan, made war on Jephthah, he sent an embassy to the enemy, with this message [ Judges, 11'25-26 ]: “Are you better than Balak son of Zippor, king of Moab? Did he ever quarrel with Israel, or fight with them? For three hundred years Israel occupied Heshbon, Aroer, the surrounding settlements and all the towns along the Jordan.
Why did he not retake them during that time?” His message tells them that Moses and Balaam the son of Beor lived 300 years before their own time.
(109) The only way to produce this total of 300 years is to reckon that the periods when foreigners ruled [the people of Israel] are included in the number of years assigned to the judges who ruled them.
If anyone counts the periods of the people's enslavement, when they were ruled by foreigners, separately [from the judges], he will produce a total which far exceeds the 300 years.
But if he counts only the years which are assigned to the judges who ruled the people, he will find that there are 300 years from Moses until Jephthah, as Jepththah's message stated.