Moist stood in the middle of the guard’s van letting his body understand the motions of the train. He rocked when it rolled and concentrated on staying upright. After all, he reasoned, if there was going to be a fight then your legs had to know what was waiting for them. Vimes was puzzled about what he was doing, but when Moist tried to explain, the commander snorted in derision.

‘In general, Mister Lipwig, I try to disable those who’re trying to do the same to me as quickly as I can. It’s a simple little approach. Not very complicated, but it helps me stay alive … that and the understanding that almost everything has a groin and every foot has a boot.’

The sound of metal and stone bouncing off the carriages came as a relief. Like an expected shoe dropping.

The train was travelling through a cutting that had once been used by wagons, and Iron Girder almost touched the rocky sides as she passed through at less than half speed. The guard’s van was in a state of siege and only later did Moist learn that grags had swung down from the sides of the cutting.

An unfortunate few dwarfs had landed on Bluejohn’s flatbed and while the biggest officer of the City Watch was at heart a pussycat, two grags trying to hack lumps out of him was clearly causing him to become somewhat acerbic and so the pussycat was now fighting like a lion. He hurled curses in trollish which actually shone red in the air as they were cast.

Quelling his nerves, Moist grabbed a jim crow and opened the trap door on to the roof of the guard’s van, to the initial amazement of the grag who had been trying to force his way in. But any sense of achievement the dwarf might have felt was knocked away by the vicious metal bar hitting his jaw with a satisfactory clang.

Moist wasn’t surprised to hear Commander Vimes scrambling up after him. And now, surrounded by grags in a state of disarray, Vimes tore off his shirt and as other dwarfs approached him Moist saw them suddenly realize that their futures were in the hands of the legendary Blackboard Monitor. Once freed, the brilliant scar on the commander’s wrist was almost throbbing in the half-light. The grags stared at it and that was the first of their many mistakes, because the commander went, as they say in Ankh-Morpork, totally librarian on them.

As Vimes charged towards the far end of the van he smacked away one distraught grag so that he landed on top of another, making it look almost balletic as they twisted and fell on to the rails below. And now the goblins joined in to make the grags’ day just a little bit more interesting: goblins in your armour was definitely not an aid to fighting.

The trap door and an adjoining panel had been torn away from the top of the guard’s van and, while battling a particularly ferocious dwarf,^[78] Moist saw Detritus levelling his enormous crossbow through the hole and heard the troll shout, ‘Piece Maker!’, a signal to anyone of sense to take extreme cover immediately. The darts that the piecemaker fired were hardwood and therefore horribly dangerous. And if Detritus was really feeling fit, the weapon spat the wood so fast that the darts ignited as they flew. Not metal, only wood, but wood going so incredibly fast that it splintered into a thousand more darts all travelling at terrible speed.