Hi Queequeg and Jim

,
I too have tried to find out more....with little sucess

Jim has beaten me with the references to Agincourt. The lead mallets used by the archers were also used to drive stakes into the ground, as a defence against horse charges. During the melee a number of archers used these mallets effectively against the French Knights (but we must consider the fact that the ground was extremely muddy and the knights had great difficulty in their mobility....this could have helped the 'effectiveness' of the use of the mallets.)
I did find a reference about an iron mallet, used as a weapon (in France) but there were no further details .....
Regards David