Does a Mercenaries attack that wins with no warbands left keep the site, and is Mercenaries discarded?

Question

Accepted Answer

The attacker wins the dice contest but leaves the site empty, so nobody rules it. Mercenaries adds dice, not warbands, and it is not discarded because the attacker did not lose.

Oath: Chronicles of Empire & Exile

Does a Mercenaries attack that wins with no warbands left keep the site, and is Mercenaries discarded?