United we stand, divided we fall

Have you ever wondered where the expression "United we stand, divided we fall" comes from? It is a traditional trade union saying but I was surprised to find it is far older. 

The ancient Greek  Aesop’s "The Four Oxen and the Lion"

The fable reads as follows:

A lion used to prowl about a field in which Four Oxen used to dwell. Many a time he tried to attack them; but whenever he came near they turned their tails to one another, so that whichever way he approached them he was met by the horns of one of them. At last, however, they fell a-quarreling [sic] among themselves, and each went off to pasture alone in the separate corner of the field. Then the Lion attacked them one by one and soon made an end of all four.

United we stand, divided we fall.