Quote Originally Posted by History Geek
OH I didn't know that... I've just sent 10 agents on paid holiday for 10 years in spain! Hmm. I wish I was my boss...

/HG
Try to get high valour spy into that province, but do leave those others there as well. Due to a bug (feature?) all of those spies will increase in valour if the highest valour spy is successful in causing a revolt. If the province has a border fort you're probably wasting your time though and will see most if not all of your agents caught within two turns.