The strategy is that skeletons have high hp for their level but lack armor. So Standard Bearer and Fortified positions are there to fix that, making them very resistant. Combined with their Non-Living immunities and Mort reconstruct, they are not easy to take down.
Skeletons being Non-Living, most enchantments don't work on them, which leaves more spellbook points for command incantations. This combine well with the new familiar Gurmarsh (did i spell his name correctly?). He is not a skeleton, but he likes to wipe them.
Battle Fury on Mort is a deadly combo, allowing to double land Tainted.