Oh and by the way, the halberd fighting style was developped to beat sword-and-shield-style. A marian legionnary would have been slaughtered by a burgundian halberdier.
that halberdiers will dead first if they face TRUE SPQR legionaries. They will become pilum cushions

Dismounted medieval knights didn't use any precursor missile weapons, as they think missile fight was "unchivalrous", so it was their obvious weakness if they face any skilled 2 handed weapons user, which in turns the 2 handed and without shields will easily pawned with crossbows...