In Empire: Total War, sometimes garrisonable buildings can supposedly fit thousands of soldiers inside - you can see this by hovering your mouse over them and looking at their information - but you can usually only tell one unit to actually enter the building. Other units might initially march to the building, but once the first unit's inside, other units will just stop right outside the door.
There are also cases when this is not so. I remember, on at least one or two occasions, moving two separate units into the same building at the same time.
Why is it then that, much of the time, only one unit will enter a building, regardless of how many men can supposedly fit into it? Is there some sort of special way you have to click on the thing to get subsequent units to go in or something? Is this just an outright bug? Thanks.