Dwarves are a short, surly race of bearded explosives experts. Their molotov cocktails are devastating, but they have no hand-to-hand (melee) attack so are useless in close combat. As they wear no armor they are very susceptible to arrows and other missle attacks.
Variant versions of dwarves include:
Mortar Dwarves, who fire an explosive cannon shell a great distance
Pathfinder Dwarves, who carry a limited number of signal flares they can use to call down 'explosive satchel airstrikes' from Dwarf Zeppelins.