First World War Campaigns - More insight into combat odds

[Ricky B]

And I would guess it then simply rounds the values off.

So for the German assaulting, you have 1063*7/5=1488. French defense is actually 5 in the early campaign.
For the French defender, you have 1039*11/6=1904.83.

So it looks to me like there is some other small factor included, at the same value for both as the lower value comes out 12 higher and the higher one at 13 higher.

By the way, this question comes up about once a year!