I fought a random comp (which turned out to be Russia) and built up a massive invasion force and began smashing away in several waves. This was the last and largest offensive (which, as of these screens, took their capital).
Here's my 1st Infantry, a bit depleted from being the first ones in:
2nd Army, my ground pounders:
Having failed to take their capital repeatedly, I decided I'd rather overdo it than underdo it. Thus, I had my 3rd Army, my reserves:
And finally the 4th Army, held back in my territory ready to stomp their outlying settlements should it prove necessary:
