Nearly a decade ago, when the Equestrian Royal Army requested for armoured fighting vehicles to assist in the Canterlot-Badlands War, nopony expected something else to evolve from this.

This request brought peace to the nation, but also brought a new, ambitious kind of extreme sport. 'Competitive Armored Warfare' or simply known as 'Competitive Tanking', where mares and stallions slug it out for the glory of victory and the grand title of the Ruler Of The Battlefield. Only the bravest and skillful will survive. Mercy will be discouraged, rules will be ignored.

This year, the Mane Six decides to enlist in the King Of Steel Tournament. Registered as the Harmony Tankers, with the power of friendship and teamwork, they will propel themselves to victory.

That is, if they can get along first... After all, the best of friends may make the worst of teammates...

-Crossover with World of Tanks
-Alternate Universe: characters are anthro, advancement in technology
-Teen: Mild violence, swearing
-Takes place after season 4
-Contains OCs
-Certain Game Mechanics have been tweaked to give some degree of realism