Bob
Despite what you may have heard, so far there has been no evidence found that there were Hebrews in Egypt at the time the Exodus supposedly happened, or that they were in the area they supposedly conquered at the time the Bible places the stories of Joshua. This is not for lack of folk looking, it's just that the evidence found so far simply does not support either the Exodus as described or the conquest of Canaan.
Here is a link to the Armana letters. When you read them you'll find that there is no sign of a general invasion or anything like a major conquest in progress. Instead, what you find is intercity rivalries, conflicts among the kings of the city-states, and some general disorder.
The issue of the Exodus and the conquest of Canaan is very much an open question. There are several possibilities, but none resemble the tale as told in the Bible.
Aslan is not a Tame Lion