The Helmbarte was a more modern version of the Rossschinder (ross = horse, schinder = hurting) a weapon designed to stop cavalry. Helm is ancient german for pole, barte for axe. A halberd usually combines the horse stopping power of a lance with the cutting ability of an axe against infantry.
The Hellebarde (halberd) was a lighter developement of the Helmbarte for parades, guard troops (today the swiss guards of the Vatikan still use them), ceremonies,
A Feldherr (translated as commander) is the highest commanding officer(or noble) who leads the Herr (army) on the Feld (battlefield). I think Alexander and Rommel are some of the few leaders who commanded from the frontline. The rest was choosing a hill and was using messengers. These Feldherrn had light decorated Hellebarden often with colourful ribbons to show there position to their troops.
With time they got more and more decorated and less useful as a weapon.
The picture below shows some halberds. Armour piercing points when knight had horses with armour, spear points in areas with no armoured horses,...
Hooks to tear knights from horses, sickles to cut legs of horses when pulling the halberd back...
Then with muskets the halberdiers build a front line against cavalry to guard their musketeers and the halberds had to become even lighter to be more mobile. No longer massive heads, but light ones with holes. They could be light because with x-bows and then muskets opponents weren't wearing massive armour any longer.
There was not just one halberd