A Story of the Stone Age by H.G. Wells

In the days before Ugh-lomi there was little trouble between the horses and men. They lived apart--the men in the river swamps and thickets, the horses on the wide grassy uplands between the chestnuts and the pines.

Sometimes a pony would come straying into the clogging marshes to make a flint-hacked meal, and sometimes the tribe would find one, the kill of a lion, and drive off the jackals, and feast heartily while the sun was high. These horses of the old time were clumsy at the fetlock and dun-coloured, with a rough tail and big head. They came every spring-time north-westward into the country, after the swallows and before the hippopotami, as the grass on the wide downland stretches grew long. They came only in small bodies thus far, each herd, a stallion and two or three mares and a foal or so, having its own stretch of country, and they went again when the chestnut-trees were yellow and the wolves came down the Wealden mountains.