@Sebskullian-0 you can find these games on ebay for not too much.
Garrisons in victory cities
-
Hey, I was wondering: after you take a victory city, do you have to leave a unit behind to show that you have control, or not?
-
no. And you have been playing risk too long :-D
-
true
-
Yes, you do. You control a zone only if you have at least one land unit in it and the enemy has no land units in it. A zone that has no land units in it is controlled by no one (bottom of page 10).