Meine Herren !
There are several interesting films on youtube regarding WW I items:
Bovington Tank Museum: The "War Horse" tank
Lock'n'load : FT17 Renault Tank Drive and machine guns in action ( the talkmaster is sometimes to prominent...)
If you are looking for WW I machine guns in action, just put in the name on youtube and the Dough Boys will deliver...
bizz bald, Gunther