[Sam the Sham]

But the entire point of the Hyksos invasion was that the Hyksos had chariots because they had horses and the Egyptians didn't.

New Kingdom Egypt, after they defeated the Hyksos, set about acquiring horses to create the mighty chariot armies that Rameses used to conquer Syria.

[SunkenCiv]

It used to be believed that the Hyksos introduced the chariot to Egypt, but that's been shown to be untrue. Horses were known in Egypt at least as long ago as the Middle Kingdom; the Hyksos (Arabs) overwhelmed the Egyptians who were undergoing a period of loss and turmoil, and horses became part of everyday life. The earliest known Egyptian images of horses appear to be from the 18th dynasty. *

Lionel Casson (I think it is) has some observations about the slow human adaptation to the horse as vehicle.

George W. Bush will win reelection by a margin of at least ten per cent.