This is a historical novel with elements of fantasy set around 6,000BC, around the time horses were first domesticated. I do find the pre-historical period fascinating. So much of what we think of as human originates in that period and I've found few novels set in that era other than Auel's serie...
So little is known about the Egypt of the Hyksos conquest that authors can arrange their plots pretty much as they choose, around a few known historical persons. Here Tarr has connected with Egypt's adoption of the horse and war chariot, which had been used by their foreign conquerors, to in turn...