On a slightly more positive and helpful note:

1) Build a Keep, church and chapter house in a province.

2) Train a crusade (takes 4 turns)

3) Drop the crusade on the province to attack.

4) Pay his holiness, the bald one, Mr Pope.

5) Add some of your troops to the crusade (as you would merge two armies)

6) Move the crusade turn by turn to your target, or simply drop it onto the target again to get it to find its own way.

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It's getting warm in here...that must be one hell of an INFERNO!