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Well, you should try going through the skeletons to the Orcish treasure – there are 4500 gold there, I think. The thing is, you have to defeat two large groups of skeletons instead of the nomads, or am I wrong? And for that, you need to avoid losing troops on the fairies by going there without armor; otherwise, the second turn is spent only on the marsh, I think. What if you attack the lepers on the first turn, take the armor, and head to the fortress? And on the second turn, try to defeat the fairies (already having armor) and the marsh, if possible – you need to try it :) And on the third turn, with the whole group of troops (skeletons + imps), try to go through the skeletons and their spawning points to the Orcish treasure :)
And are the Orcish ruins guarded by anyone other than skeletons?
I defeated one group of skeletons with 3 dogs, but I got tired of it after that.