Books on masks from the Americas and Africa are plentiful. The European masking tradition is a lot harder to find good information on. One book I have that has a European section is "Masks, their meaning and function" there are a few copies on Amazon UK. This book is general with rather wide and basic interpretations of the function of masks in Europe but interesting none the less. The pictures of European masks concentrate on the Alpine and Tyrol tradition.
Anther book available on amazon UK is "the masks of Prof. Agostino Dessi" This book is a about the contemporary Venetian festival masks made by the Prof.
Much the same basic information found anywhere but is very pretty to look at and is a living tradition. I know this is not about weapons but one picture cannot hurt?