Much to my surprise, I won the prussian campaign with the Frenchs after... 2 turns :
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Current morale win level is very easy to reach. One battle won can get you up to 9 NM. I had a few big one during turn 1, then smaller and easier battles during turn 2. This one got me 9 NM :
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That's probably too much and the scenario is over before you even get to see any Russian. Maybe tone down the NM for winning battles ?