The Macedonian Phalanx was one of the most frightening and effective tactics of the Hellenic and Hellenistic ages. Men packed tightly into long rectangles, each carrying a fifteen foot spear and decked in breastplates, helmets, and shields, must have been an impressive sight for those poor Persian light infantrymen called to engage them. Their primary defense was not their armor but their spears, held out in front of them--any infantry or cavalry attempting a charge would have to break through the first five rows of spearheads to get to the first line.
Cluster munitions dropped lengthwise across the line prove remarkably effective.
(What does this have to do with the mythos? One of the primary points of action in the stories that buzz in my head involve ancient, elder and out-and-out eldritch magicks with more-or-less outdated actual tactics [imagine the phalanx above, but with alternating spear lines replaced by dedicated fire mages, and the individual spearmen superheating the tips of their spears with their fingers] fighting a modern military with modern tactics [air strikes, etc.]. This was just a joke along those lines.)