man, this mod is really evil on the challenging setting.
is it possible to be used with other mods, lets say... Corrosion?
As long as the mods you wish to combine with Fortress Defense also include the default weapons, armor, languages, minerals, materials, etc there shouldn't be a problem.
For the Corrosion mod, you'll need to import the vanilla item_armor, language_DWARF/ELF/GOBLIN, item_weapon, item_trapcomp, item_toy, item_shoes, item_shield, item_pants, item_helm, item_gloves, and inorganic_metal - at least, this is what I can tell from preliminary examination of the Corrosion mod.
You'll then need to resolve these duplications somehow:
Duplicate Object: inorganic BISMUTH_BRONZE
Duplicate Object: inorganic BISMUTH
Duplicate Object: inorganic ROSE_GOLD
Duplicate Object: inorganic BLACK_BRONZE
Duplicate Object: inorganic STERLING_SILVER
Duplicate Object: inorganic BILLON
Duplicate Object: inorganic NICKEL_SILVER
Duplicate Object: inorganic ALUMINUM
Duplicate Object: inorganic LEAD
Duplicate Object: inorganic PEWTER_LAY
Duplicate Object: inorganic PEWTER_TRIFLE
Duplicate Object: inorganic PEWTER_FINE
Duplicate Object: inorganic TIN
Duplicate Object: inorganic ELECTRUM
Duplicate Object: inorganic PLATINUM
Duplicate Object: inorganic BRASS
Duplicate Object: inorganic BRONZE
Duplicate Object: inorganic ZINC
Duplicate Object: inorganic NICKEL
Duplicate Object: inorganic COPPER
Duplicate Object: inorganic SILVER
Duplicate Object: inorganic GOLD
Duplicate Object: inorganic IRON
Duplicate Object: item ITEM_WEAPON_SCIMITAR
Duplicate Object: item ITEM_WEAPON_MORNINGSTAR
Duplicate Object: item ITEM_WEAPON_FLAIL
Duplicate Object: item ITEM_WEAPON_AXE_GREAT
Duplicate Object: item ITEM_WEAPON_SWORD_LONG
Duplicate Object: item ITEM_WEAPON_SWORD_2H
Duplicate Object: item ITEM_WEAPON_SPEAR
Duplicate Object: item ITEM_WEAPON_PICK
Duplicate Object: item ITEM_WEAPON_CROSSBOW
Duplicate Object: item ITEM_TRAPCOMP_MENACINGSPIKE
Duplicate Object: item ITEM_TRAPCOMP_ENORMOUSCORKSCREW
Duplicate Object: item ITEM_TOY_BOAT
Duplicate Object: item ITEM_TOY_PUZZLEBOX
Duplicate Object: item ITEM_SHOES_BOOTS_LOW
Duplicate Object: item ITEM_SHOES_BOOTS
Duplicate Object: item ITEM_SHOES_SHOES
Duplicate Object: item ITEM_SHIELD_BUCKLER
Duplicate Object: item ITEM_PANTS_LEGGINGS
Duplicate Object: item ITEM_HELM_HELM
Duplicate Object: item ITEM_GLOVES_GLOVES
Duplicate Object: item ITEM_ARMOR_LEATHER
I'm finally going to add some of these to my game, too, for more action. I don't want it to be all about fighting so I thought I'd go for stranglers, blendecs and warwolves as a nice mix of difficulty levels. Maybe minotaurossi too if I feel brave -- or bored. Those who play with the full or almost full mod: do you get any caravans or is it pretty much combat around the clock, the whole year?
Luckily, the Fortress Defense mod is tailored for easy customization of this kind
It's not combat around the clock. Invaders arrive in the last month of every season and you can get rid of them all within a month with decent defences. The problem is that caravans often arrive in the last month, or not at all, so you can go years without any trade.
There is only one late-game civ (War elephants) that attacks during the autumn in Basic, meaning that the dwarven caravan will make it through unless that civ or the goblins attacks. Furthermore, war elephants were not among the civs keric selected, so autumn trade-blocking should not be a problem. The readme has more information on civ active seasons.