I can't find an equation for this. I found this:

"Mar 3rd 2018, 9:53:30
qzjul
Administrator
Game Development
9941

Aug 23rd 2013, 18:42:43
Hi All,

As most of you are aware, when you attack somebody, the returns you get are based on the relative NW's; ie, when your nw is approximately 95% of your target nw, you get a base of 7.5% of their land."


Can anyone provide more details?

Those who know it has spent hours on alphaffa to learn that. Very hard to share such hard bought information.

Those returns he is talking about tho, are old.