Before any army may either raid or invade, the proper war preparations must be made. War preparations represent the accumulation of the necessary suplies or the raising of a siege train to accompany the troops going into battle. Intents to raid or invade may be declared on any turn, even during peace years. You must declare the intent to raid or invade one turn prior to either raiding or invading.
Formal allies may neither raid nor invade each other's provinces, and certain provinces in the game may not be invaded under any circumstances. These provinces, for reasons of size, geography, or special protection, are not subject to conquest by any kingdom. The non-invasion provinces are The Mysterious South (#363), Pathenia (#364), The Land of No Return (#365), and the Barachan Isles (#201).
Intent to Raid: This declaration will cause the necessary preparations to be made for raiding a specified province. It costs your treasury a minor but noticable amount to make these preparations. If after declaring this order you do not in fact raid on the following turn, the war faction at the royal court will have to be placated ("bought off") at an additional cost to your treasury. If you want to raid a province with more than one army, you must declare one raid intent for each army. Example:
I DECLARE an (I)ntent to (R)aid (XYZ)
Intent to Invade: This declaration will cause a tremendous amount of supplies and equipment to be made ready for an invasion of a specified province. It costs your treasury about three times as much for these preparations as it does to prepare for a raid. If after ordering these preparations your kingdom does not in fact invade on the following turn, your war faction at the royal court will have to be appeased at an additional cost to your treasury. If you want to invade a coastland province with both imperial navies and arnies, you need only one intent to invade that province. Example:
I DECLARE an (I)ntent to (I)nvade (XYZ)