Garrison
An Adventure map object used for storing armies. Enemy heroes can't pass the garrison without fighting the armies stationed in it. Garrisons can be aligned both horizontally and vertically. Since the creatures in it neither have the benefit of a hero leading them nor the defensive structures of a Town with a Fort built in it, they tend not to be of much use.
Warning: Mapmakers may set up a garrison so that the units stationed in it cannot leave. Make sure that isn't the case before storing anything you might want to use later on in them.