Although I haven't played a full GH campiagn, don't they also get Naptha Throwers? I use them a lot in defense (and sometimes in offense), and I always pair them up with Korean Spearmen. The spearmen are going to die anyway (and ridicoulsyly fast too!) so why not make use of them? Otherwise, thats the only thing I can really think of to use KS. Of course, someone imagitive could have come up with something better....