Forrest
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By the way, the damage from shots is 4 times less through walls (1/2 for distance, 1/2 for the walls themselves).
The name of the map, by the way, is Rampart.
So, when storming a swamp with a Rampart, the following units might defend it: 4 flyers - Golden Dragons, Pegasi (not necessarily upgraded), unupgraded Wyverns, Angels.
1 ranged unit - upgraded Elves.
2 melee units - Unicorns and Centaurs (possibly upgraded).
In the castle, they will most likely be greeted friendly by the entire garrison.
And the fast flyers, due to the tactical maneuver of wait-attack-fly away-wait, etc., can quite easily resolve the issues.
Well, then, by analogy. In the swamp, there are Hydras (clearly more than Golden Dragons), Cows, Geese, twice as many as in the Rampart (and Monarchs), Angels, Basilisks, Flies, Lizards. + 100 damage from towers each round. + swamp's super abilities. Clearly, the swamp has a significant advantage. I'm ready to play such a battle with non-believers.