@Imperious-Leader Indeed, that is an official boardgame rule. Page 13:
“A tank can “blitz” by moving through an unoccupied hostile territory as the first part of a move that can end in a friendly
or hostile territory. The complete move must occur during the Combat Move phase. The tank establishes control of the first territory before it moves to the next. Place your control marker on the first territory and adjust the national production levels asyou blitz. A tank that encounters enemy units, including antiaircraft artillery units or an industrial complex, in the first territory it enters must stop there.”