Longdead Archery vs SC's/High Quality Summons

[incognito]

In the countless efforts to bring down SC's, I rarely see massed longdead archers cited. It seems these guys are ridiculous value for the money against high value troops & SC's. You can easily get more and the bane venom effect will kill off the SC/devil/summons at the conclusion of the battle. Groups of 40 archers are so ought to be able to carry the field vs single SC's. Larger groups would inflict heavy damage to massed expensive troops that are not as easily replaced as the archers.

Am I missing something on the effects of bane fire/venom? Is there a good counter for the SC focused player against these guys and massed undead as support?