It is a well-known fact that where domestic animals are used for specific purposes from generation to generation, the descendants are easily, as a rule, subdued to the same uses.

At that time in Northern Mexico the mule, or his ancestors, the horse and the ass, was seldom used except for the saddle or pack.

At all events the Corpus Christi mule resisted the new use to which he was being put.

The treatment he was subjected to in order to overcome his prejudices was summary and effective.
The soldiers were principally foreigners who had enlisted in our large cities, and, with the exception of a chance drayman among them, it is not probable that any of the men who reported themselves as competent teamsters had ever driven a mule-team in their lives, or indeed that many had had any previous experience in driving any animal whatever to harness.

Numbers together can accomplish what twice their number acting individually could not perform.