I was able to get a Crusade against Arhus. Before I took the settlement with my Crusader army, I had all of my leaders and military units, wherever they were, join the Crusade (In preparation I had stacked them in large groups), a sort of 'marshalling of the reserves'. Then I took Arhus. I got a lot of money from the Pope as a reward for my huge force and all my units got an extra level of experience.
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