First, I would move the left Horseman to the tile in between the forests and the right Horseman to the tile right of the Swordsman. Then, I would pull the left archer to the NE, then I would attack the right Swordsman with both archers, then I would attack with both horsemen.
This Swordsman is now dead, the other Swordsman can only attack the horseman that killed his friend. If he does so, then the right archer moves to the place from which the victorious horseman attacked from last turn, I move the other archer one tile to the left, then attack with both archers, then move the healthy horseman into the left forest, attack with that one, then attack with the other horseman, which should be enough to kill the swordsman, if he isn't dead yet.
As for the scout, I don't think he can do much. Horseman would almost be able to one-hit them. Archers do not ever need to move more than one tile, so ZoC is not important.