If people are not aware of this website then they'll find a good resource for a lot of WW1 video archival footage from troops to aircraft to tanks. Home site: http://project.efg1914.eu/
Much of the fottage has been extensively restored
For example;
Schneider Tanks: http://www.cnc-aff.fr/internet_cnc/Internet/ARemplir/parcours/EFG1914/pages_FR/131851.html
Italy at War: http://www.cnc-aff.fr/internet_cnc/Internet/ARemplir/parcours/EFG1914/pages_FR/36.html
75mm SPG mounted on an FT-17: http://www.cnc-aff.fr/internet_cnc/Internet/ARemplir/parcours/EFG1914/pages_FR/10213.html
You can search by location too: http://www.cnc-aff.fr/internet_cnc/Internet/ARemplir/parcours/EFG1914/pages_FR/lieux.html
anyway, get searching and viewing and enjoy