Okay, so I'm playing as Serbia in the Balkans Scenario.
In 2012 Macedonia declares war on me. But I'm not too worried, my military is pretty massive (some 252 deployed units and 211,000 active personnel with about ~300,000 in reserve). My forces, with initiative set at 100%, begin smashing them immediately. Training and morale, apparently, play an absolutely enormous role in combat in SR2010. Whilst numerically inferior on my southern front for the very short term, my units inflict losses of 8,000+ on the very first day, suffering only 1,250 casualties.
To cut a long, long story short, the diplomacy thing makes my life difficult because every other AI declares war on me within two weeks. That's Serbia vs 6 AI regions. I'm thinking 'Oh, yeah, but I'm the biggest power (read: most units) here, so it doesn't matter'. When my Kill/Loss unit ratio goes up to 200/7 in a week, I start getting worried.
Skip forward a month, and the conflict is over. I have won.
From 23 May to Jul 6 the casualties were as follows:
(Civilian and military casualties are calculated together)
Republika Srpska: 34,352
Unknown (non-Serbian civilian casualties of otherwise unknown ethnicity): 68,872
Total: 446,550 casualties (both civ. and mil.)
Daily: 11,163 casualties
The number of dead should roughly be about 1/3 or 1/4 of the above figures.
And the final unit kill/loss ratio: 1515 units killed, 35 units lost.
Pretty damned intense.