Oops! What topic have I stumbled upon again? =))) Why is it that whenever a topic about a Castle comes up, there are always people who say that this Castle is the worst (like in the Inferno topic, for example). I keep repeating that the balance in Heroes is almost perfect. You just need to know how to play each Castle... Each Castle has its own tactics, and the Swamp is no exception. To capture Castles for this city, take Ballistics. You get them quite often in this Castle. Break through the gates in 1-2 turns, and crush all the enemy units inside with Hydras!!! If you don't like Ballistics, catch the heroes in the field. When playing, don't focus on the downsides while ignoring the advantages; do the opposite, and you'll see that the Swamp is actually quite strong! Swampy terrain is a huge advantage for the Swamp! There is no penalty on other terrains, or it is much smaller! (the exception is snow - the penalty is also high there, but lower than in the Swamp). In general, when moving across the main territories, Swamp creatures are on par with the others, even with those for whom "grass" is their native land. But on the Swamp, Swamp creatures move twice as fast!
In general, if you think that the Castle is weak, then forget about the others and learn to play with this one =)))) You can play equally well with ALL of them! The main thing is desire!!!