This is what just happened in my Bactria campaign, the Seleucids assaulted Baktra, and a unit of Thureophoroi was moving up the siege tower when


It caught on fire thanks to the work of my archers. Around 70 Thureophoroi died when the tower collapsed

The first time I've had an enemy siege tower catch fire after it has reached the wall, it can't have been fun to watch for Molon (the Seleucid general).