Looking for an Urban Assault Module

[Apocalyptic Dream]

Any suggestions for a module that deals with defending a city? I am aware that Rise of the Runelords book 5 deals with that, but, I'd like to avoid that since I want to run RotRL one day. I am open to any system or publisher that deals with defending a city from an assault, as I can convert most systems to Pathfinder with a little work.

Curse of the Crimson Throne spoiler:

My players wiped on Vreeg. They seem fairly cavalier about their deaths, saying, "Oh, well, the next party will probably be hired to find out what happened to this party." I would like to avoid that scenario and teach them that what they do has an effect on the world, even their deaths effect the world.

To that end, I am considering having the Shoanti declare war on Korvosa for failing to return Gekken's body in a timely matter. I think the queen would encourage war, and possibly use it in conjunction with Sabor's "execution" to stir up more riots within Korvosa.

[Anonymous Visitor 163 576]

Tower of the last baron is about a village and a small fortress. Run normally, the PCs are on the outside, but that's a quick fix.

[Anonymous Visitor 163 576]

Tower of the last baron is about a village and a small fortress. Run normally, the PCs are on the outside, but that's a quick fix.

End of red hand of Doom might work, check the conversion thread for the updated version.