Jan, an ISD is 1600 meters in length alone. You had five Defender Gunships stated as covering them both - that's a total of 1000 meters they can protect.

It's quite easy to fire past them to strike the Star Destroyer itself.

That means that one ISD was struck by missiles and took damage, and then was attacked by five Star Destroyers. That would mean heavy - severe damage, imo.

The other ISD was struck by surface fire and is currently being assaulted, without shields, by two Reign Class Star Destroyers. Again, that would mean heavy - severe damage.

The first two ISDs are destroyed as a result of surface fire, which you agreed to.

The final five ISDs have been attacked over two posts by four ISDs, and started off without shields. Targetting specific systems (shields, power grids, gun controls, bridge, etc.) that again means heavy - severe damage to those ships.

1.The Defenders knew where the surface emplacements were and were covering it.
2.I thought all the surface guns fired at the two already hit by surface guns. I didn't realise they fired at three targets. Will let you have that at heavy damage
3.I guess I forgot to power up shields.

Total damages:
2 ISDs-destroyed
4 Defender Gunships Destroyed
1 Defender Gunship-heavy damage, not able to make hyperspace-set to self-destruct
2 ISDs-inoperable
5 ISD-Heavy Damage

That's why surface guns can track, Jan. They point at the section of the ISD that the Defenders aren't.

But those damages sound fair.

Ok. I'll post now.

It's actually no Defenders destroyed, 3 Heavily damaged. I forgot that they didn'tt block the Advance Turbolaser fire.