From the Burning Wheel store page:
Swords & Strongholds is a game invented by David Petersen for his Mouse Guard graphic novels. Recently, he asked Luke Crane (of Burning Wheel and the Mouse Guard RPG) to come up with some rules for the game and so we did!
We developed a light strategy game for two players that takes 10 to 20 minutes time per game. It's exactly the sweet spot we hoped for—a game you can play while you're sitting at the June Alley Inn listening to tales, or when you're waiting for your friends to arrive for a game night, or when you're waiting in long lines at comicons!