2 or les is OK but some artillery like Long tom and 88mm canon must have specefic capabilities.
Long tom = Attacker first shot attack. In the first round of combat, on a roll of 2 or less, enemy lost 1 infantry without reply.
88 canon = German player can roll 1 die for each tank. On a roll of 1, enemy lost 1 tank.it may add confusion to the game, maybe if they were development tech options that improve artillery.
the 88 cannon sounds more like an anti-tank gun if used this way