My grandfather fought in tanks in WW1. I'd thought he was in the first battle, but was corrected by an individual who has researched everyone involved in that very first tank action:
An interesting site, and the owner was kind enough to reseach my grandfather's war records and provide me with a full history of his service. Gramps was recruited into the Motorcycle Machine Gun Service, and from there, moved to tanks. He missed the seminal battle at Flers but fought in tanks for all of WW1. Wounded once but returned to action. Fought in the tanks pictured above and eventually in the whippets.