I spent too much time with my Templar Awareness meter full and now they're attacking one of my dens. It's way the heck on the other side of the city from where I am, and I'm in the middle of something. I don't feel like running back over to defend the den. What will happen if I don't? Will I lose the den and have to re-capture it from the Templars, or will they just keep attacking until I show up and defend (or fail to defend) it? Will the den-on-fire icon just stay on my map, or will it go away eventually?
I'm very early into the game and I haven't done any recruiting/assigning of assassins, or anything like that. So: what are the consequences of letting one of my dens fall to the Templars?