Judges 7:10

But if thou fear to go down
With his little army, to attack a numerous host in the night, then he is directed to take this step first:

go thou with Phurah thy servant down to the host;
in a private manner; perhaps this man was his aid-de-camp, or however a trusty servant in whom he could confide, as well as valiant: more it was not proper to take in such a secret expedition, and the fewer the better to trust, and less liable to the observation of the enemy; and yet it was proper to have one with him, being company and animating, and who would be a witness with him of what should be heard; in like manner, and for like reasons, as Diomedes and Ulysses went into the Trojan army ^F25.