Tactics for the Swamp (Fortress).

I'll add a bit, as I've tested a lot in the swamp map. There are many features; it's impossible to describe them all, and probably not worth it. Getting a single unit is not a problem for any hero if you have Vives and Basilisk, not necessarily on turn 112, but that's not important. Gnomish units-20 can be placed without problems, even not on grass. The trick of the swamp map is that if you have ranged units or a good army of a secondary hero, you can confidently attack the Medusa lair with a large group on turn 1. In terms of development, there are two directions: Hydras in the Citadel – standard (there are usually no problems), if you're short on gold, you can also go for a Fortress. Or, there are options without Hydras in the Castle-Citadel; I rarely go for this, but sometimes placing Cows is justified. I don't usually place units on turn 1-7 in the Castle, although there were sometimes opportunities; I usually prefer to save for upgrading Lizardmen.