Is there an amphibious assault stacking penalty in Iron Cross?

[zhivago6]

This is my first time playing as Japan in IC and I want to knock out China as quickly as possible. Is there a stacking penalty for my amphibious assaults? Should I just attack with 3 marines at each location, or can I put all 12 in one stack and blast through?

 

[RisingSun]

I wouldnt put all twelve in one place too quickly, 2-3 should be ok and besure to have warships to bombardment there, then bring another wave of transport in the next day if needed. Some air supports can help too, that how the Japaneses manage to grab most China's coastal lands so quickly.

 

[zhivago6]

Well, 2 landings proved easy, and 3 failed. All landings involved a stack of 3 marines and included shore bombardment and air support. I sent the failures back to Japan to recover. I spent so much time planning the attack that I thought it would be flawless. I guess no battle plan does survive contact with the enemy.

At least my attack from the North is going according to plan, I have Chiang Kai-shek and his stack of 12 inf. surrounded.