Damage taken by disembarking troops.

I had a pack of 10 lvl 3 interceptors along with strategic bombers ( 695 ) attack my allies 28 disembarking armies (476 HP ) and covering navy ( 340 HP ). They were Pan Asian but I figured they would hit me for 20 hit points.

Instead my ships suffered 5 HPs and the disembarking army suffered 40! The ships made sense but even if the army had disembarded they may have suffered 20. The planes lost an expected 57 Hitpoints.

The planes were actually in patrol ( maybe 30 planes ) and I was subtracting half of the above on every pass. That game was a few months ago but I just killed some disembarkers quicker then I should recently and thought I better find out what exactly to expect.

Thanks