Table tactics sells “mines” the standard idea for house rule is each unit that passes has to make a saving roll to move into the territory. If a one is rolled then the unit is destroyed. Infantry can be used as “minesweepers” and for each unit hit, each friendly can then roll a saving roll negating the hit on a roll of 1-2. Example: you move 3 tanks and 5 infantry into Novo (you are Japanese). the Soviets bought a mine unit. The phasing player rolls 8 times, netting 1 tank and 1 infantry hit, Next the 5 infantry roll trying to get 1-2, but only get this 1 time, so the tank hit is negated and the Japanese lose only one infantry.
Mines cost about 3 IP each, cannot move, and once disarmed by infantry are removed from play… Anything else just let me know… This should work for all games