I would start with a warm water bath, rinsing well to remove ANY comtaminates from the wounds.
Then isolate the birds from others and from any noise/distraction. Provide feed & water with a cap full of apple cider vinegar. Provide warmth from a heating pad or other source.
If the bleeding has stopped, you might apply a little ointment to the wounds with a Q-tip...just a little. The bird will try to peck at any excess.
If the wounds start to stay wet or ooze then they have to see a vet asap. If they are flesh wounds only then keeping them clean and the bird quiet will allow the bird to heal itself.
Warmth, isolation and above avg feed (fresh greens, vitamins) will do as much as anything. If they become infected time is short. Ducks won't act sick until they are ready to fall over.