Exodus 14:5-7

When the king of Egypt was told that the people had fled, Pharaoh and his servants had a change of heart toward the people, and they said, “What is this that we have done? We have let Israel go from serving us!” So Pharaoh harnessed horses to his war-chariots [for battle] and took his army with him; and he took six hundred chosen war-chariots, and all the other war-chariots of Egypt with fighting charioteers over all of them.