One interesting point about the new defence for Armies is that its not across the board, some nations get it and some don't!
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Army SD/TD = 2
UK
USA
USSR
Germany
Finalnd
Spain
Sweden
Switzerland
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Army SD/TD = 1
France
Italy
Canada
Poland
+ all other minors
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I am surprised by this, afaik it's the first stat that is different by nation. Seems a little cruel on France and Italy too... and a little generous to Finland/Spain/Sweden/Switzerland perhaps?
As the defense boost essentially makes attacking against it costlier in casaulties it gives the majors a defensive boost vs minors, and makes major vs major (or where defense=2) bloodier.
I think I prefer it with SD/TD = 2 across the board for armies, just make armies costlier to attack for everyone.