Around the size of a sedan, this particular model artillery boasts functional tractor treads, an engine ... a WW1-era combat ...

The US Army's early attempt to create an armored vehicle fell short. See images of the flawed but influential Holt hybrid tank.

ENGINE PURRS Here, there was no mud, and tanks were deployed in much larger numbers. Almost 500 tanks took part in the battle. HORACE: We got in, shut down our tanks and we set course for the ...