"However, the most unequivocal early archaeological evidence of equines put to working use was of horses being driven. Chariot burials about 2500 BC present the most direct hard evidence of horses used as working animals. In ancient times chariot warfare was followed by the use of war horses as light and heavy cavalry."
Long discussion in History Exchange about dating the cave paintings mentioned in the wikipedia article above:
"However, the most unequivocal early archaeological evidence of equines put to working use was of horses being driven. Chariot burials about 2500 BC present the most direct hard evidence of horses used as working animals. In ancient times chariot warfare was followed by the use of war horses as light and heavy cavalry."
Long discussion in History Exchange about dating the cave paintings mentioned in the wikipedia article above:
https://history.stackexchange.com/questions/68935/when-did-h...