La Louvre
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Winner, thank you for your response!
This mission was quite easy. My enemies were always stationed near the castles and didn't even bother terrorizing the towns. I just ran around the map, collected resources, and built up my army. Only twice did heroes appear with very small armies. I defeated them all without even having to disrupt any of the towns. The only problem was that there was a catastrophic shortage of money in this mission.