The logistics problems entailed by an Exodus, as biblically described, are so formidable as to render it impossible. The bible suggests that 3 to 3.5 million people were involved. This would require 1500 tons of food daily and that would require two, mile long, freight trains daily. Who grew this food and where was it grown? That food needs to be cooked and that would require 4000 tons of wood daily to be carried by about six more mile long freight trains daily. Oh my, what about water? A conservative estimate is that 11,000,000 gallons were needed daily. To carry all this a train of tank cars 18 miles long would be required daily. The nightly camp would have to be roughly 750 square miles. Can you just imagine distributing all that food, wood and water in such a camp? We haven't even touched on the care of their animals. For these reasons I believe that the bible account is mythological in nature. If there actually was an Exodus it must have been very much smaller --- perhaps a few hundred to a few thousand of people. It also could have consisted of a number of these smaller migrations over several generations.