Yes, as said the first tank to engage in battle was D1, a British Mark I, during the Battle of Flers-Courcellette (part of the Battle of the Somme), on 15 September 1916, one of two to breach German lines and reach Flers, but was knocked out by friendly fire (must have been the yanks!!)
lol yeah that's right, however the first tank-tank engagement was in 1918: googled here:
Tank Versus Tank
The first successful display of German tanks came on 24 April 1918, when thirteen German models, chiefly A7V's, engaged British and Australian infantry at Villers Bretonneux.
Successful in driving back the British and Australians this encounter was to become famous as the site of the first tank versus tank engagement. Three British Mark IVs fought three German A7Vs south of Villers Bretonneux, the British succeeding in driving off the German tanks.
Well I wa being facetious stewey. But knowing the Yanks, anything is likely. They also helped us out at the Battle of Balaclava didn't they?? I think Tom Cruise was a general.