War hammers were developed as a consequence of the ever more prevalent surface-hardened steel surfacing of wrought iron armors of the late medieval battlefields during the fourteenth and fifteenth centuries. War hammers, especially when mounted on a pole, could damage without penetrating the armour. Source: Wikipedia
The axe, or ax, is an implement that has been used for millennia to shape, split and cut wood; to harvest timber; as a weapon; and as a ceremonial or heraldic symbol. The axe has many forms and specialized uses but generally consists of an axe head with a handle.