(Pictures are deeplinks to larger ones)

Some of the christian archers had positioned themselves on a raised bit of land over an old mine entrance just outside the walls to get a better shot at the enemy troops on the walls. It turns out that wasn't the best place to set down.

Here's the siege tower the crusaders used:

And here's some of the minifigures that duke it out in this siege.

A brickshelf folder with more pictures can be found here.