Those heavily wounded and demoralized survivors do include the rest of the army of the West, including two units of artillery (one being an Offensive Genius) and the nymphs. We already are unsure we can beat von Trotha, adding even low quality troops to his army will make beating him even harder.
Actually, a thought.
@Photomajig, in battle, the Nymph trait provides bonuses to Resting for adjacent units, which I assume works in-universe due to Nymphs having healing ability/a soothing effect on Morale. Does this ability also work outside of battle, on the campaign level? Can we expect the survivors of the Army of the West to return to fighting shape faster than normal, due to the presence of the Nymphs?