Look at this one. White has complete control of a corner, but it's no help, because the King is trapped over on the other side of the board and can't get there. However, as long as one of the white warriors has a safe square to move to, it's still a draw position. The "active" part of the fort (where the movement happens) can be shaped like any draw fort, for example, a cloister or a bunker.
This one is called "The Garbo" after Greta Garbo, who famously said "I want to be alone"... Well, maybe the king doesn't want to be alone, he would actually quite like to join his friends. However, if winning is not an option, getting a draw is certainly better than being defeated!