Adam Clarke on 1 Samuel 14:1

Come, and let us go over - This action of Jonathan was totally contrary to the laws of war; no military operation should be undertaken without the knowledge and command of the general. But it is likely that he was led to this by a Divine influence.

The armor-bearer is the origin of what we call esquire, from escu, old French, a shield; armiger is the Latin, from arma, weapons, and gero, I bear. In the times of chivalry, the armiger, or esquire, was the servant of the knight who went after him, and carried his lance, shield, etc. It is now (strange to tell!) a title of honor.