War of Conquest
War of conquest is the war between two kingdoms at a conquerable place: a colony or city. Compared to plunder attacks, conquest attacks are much more severe and risky, because it is meant to destroy its target. One of the two combating armies will be reduced to zero at the resolution of the attack, and thus this offensive mode should be limited to targets that are meant to be eliminated.
After a conquest attack, if the attacking kingdom becomes victorious, it takes the land from the defender by killing all of it's troops and gains a certain amount of gold booty. Otherwise, the attacker looses all of it's troops, but the defender still remains to be the owner of the land and gains gold booty.
Recommendation: Conquest attacks usually involve higher risks and may require spying beforehand.