Behold the answer to your question!
This is most probably caused by rebellions. There is a column in unitprod with numbers with all the different rebellions. If a rebellion occurs MTW will look into that column and makes an army with units that have that rebellion listed in their column.
After turn 1 it is likely that a few provinces will rebel if you didn't put garrisons in all of them. MTW now tries to make a rebel army.
But since you deleted loads of units you have probably also deleted the rebellion entries. So MTW cannot find entries with that rebellion and then it crashes!
To solve this you need to give your new units those rebellion units. First step is to make sure that all of them are included. Next step is to tweak the rebellions so that they have a good setup.
And make sure that you include all the rebellions! If you forget a rebellion that very rarely occurs then your game might crash at turn 43 leaving you either stumpified or you will remember this.
Good luck with it and let us know if this was the problem.
Cheers, Duke John
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