[0.255 CRASH] Crash within city screen

On turn 315 (wow, I don't think I've ever made it that far before), I was attempting to select a troop in a town display to move it out of the town.  I clicked on the troop, then right clicked on the square where I wanted it to go.  The game froze for a few seconds, then the screen went gray except for the outline of my area of influence and the outline of the coastline.  Sorry, I couldn't get a screen shot because the Windows "Turn based fantasy strategy game has stopped working" came up and the game terminated. 

Debug.err, dxdiag, and dump submitted to fogbugz.