Actually, the food and supply line one is okay since its not so much an auto hit to the army itself.

The Disabling men due to morale is an auto hit. So that needs to be changed. Perhaps the ability is the units can disguise themselves as enemy soldiers. By doing so, they are able to sow disloyalty in the enemy forces. They blend so well that they cannot be discerned from ally soldiers for up to three posts. Any assassination attempts or turncoat actions would break the camouflage. Keep the group at or under 100 men though.

The intel one as my previous post is okay.