[Tuor in Gondolin]

I would think a devastating dwarf weapon,
especially for use against cavalry would be
something akin to the Swiss halberd.
Obviously shortened for Middle-earth dwarf use.

[A halberd (also called halbert or Swiss voulge) is a two-handed pole weapon that came to prominent use during the 14th and 15th centuries. Possibly the word halberd comes from the German words Halm (staff), and Barte (axe). The halberd consists of an axe blade topped with a spike mounted on a long shaft. It always has a hook or thorn on the back side of the axe blade for grappling mounted combatants. It is very similar to certain forms of the voulge in design and usage. The halberd was 1.5 to 1.8 meters (4 to 6 feet) long.