Blasterman wrote:"Pikes" were anywhere from 12 -15 ft. long, some even longer.
Used to stop the calvary charge, hence the length.
"Pollarms" were usually 4-6 ft. long intended for foot combat.
Most were fitted with an axe type head of
some sort, along with top spikes and back spikes.
There were some versions with hammer heads too.
A pollaxe - bill, glaive, etc. would be around 8-10 ft. long.
Again, intended for foot combat. The ability to reach into
the 2nd or 3rd row of the enemy ranks is deadly.
My "pike" is a combination between a pike and a pollaxe,
which gives you the option of cutting it down.
There you have it.
12 feet would be an extremely short pike (Scottish?). The Swiss used 15-20 foot pikes (they could get longer). I've never seen it specifically stated for medieval combat, but I presume it followed the same pattern that it did when Alexander's successors started fighting (pike facing pike would get progressively longer searching for an edge until they reached a terminal unwieldiness somewhere around 22-24 feet).
A poleaxe (yes, I know, is was refering to the poll and not the pole) is a specific polearm, favored by heavily armored knights fighting on foot, and doesn't particularly resemble your polearm. Which points up the difficulty of polearms in general since the terminology and nomenclature isn't exactly standardized, but I haven't seen "Pollaxe" used as a generic for polearm (which may only mean that my study has been limited). I'd say that a case could be made that your polearm is either glaive-based or bill-based - the experts can't agree, so I don't have a problem not agreeing with myself!
Anyway, my two cents worth, and that may be overestimating the value.
