Men at Arms (Discworld 15)

'Again?' Colon unhooked the cell keys from their nail over the desk and tossed them to the thief. 'All right. Cell Three. Take the keys in with you, we'll holler if we need 'em back.'

'You're a toff, Mr Colon,' said Here'n'now, wandering down the steps to the cells.

Colon shook his head.

'Worst thief in the world,' he said.

'He doesn't look that good,' said Angua.

'No, I mean the worst,' said Colon. 'As in “not good at it”.'

'Remember when he was going to go all the way up to Dunmanifestin to steal the Secret of Fire from the gods?' said Nobby.

'And I said “but we've got it, Here'n'now, we've had it for thousands of years,” ' said Carrot. And he said, “that's right, so it has antique value”.'[4]

'Poor old chap,' said Sergeant Colon. 'OK. What else have we got. . . yes, Carrot?'

'Now, they've got to take the King's Shilling,' said Carrot.

'Right. Yes. OK.' Colon fished in his pocket, and took out three sequin-sized Ankh-Morpork dollars, which had about the gold content of seawater. He tossed them one at a time to the recruits.

'This is called the King's Shilling,' he said, glancing at Carrot. 'Dunno why. You gotta get give it when you join. Regulations, see. Shows you've joined.' He looked embarrassed for a moment, and then coughed. 'Right. Oh, yeah. Loada roc—some trolls,' he corrected himself, 'got some kind of march down Short Street. Lance-Constable Detritus – don't let him salute! Right. What's this about, then?'

'It Troll New Year,' said Detritus.

'Is it? S'pose we got to learn about this sort of thing now. And says here there's this gritsuc—this dwarf rally or something—'

'Battle of Koom Valley Day,' said Constable Cuddy. 'Famous victory over the trolls.' He looked smug, insofar as anything could be seen behind the beard.

'Yeah? From ambush,' grunted Detritus, glowering at the dwarf.

'What? It was the trolls—' Cuddy began.

'Shut up,' said Colon. 'Look, it says here. . . says here they're marching. . . says here they're marching up Short Street.' He turned the paper over. 'Is this right?'

'Trolls going one way, dwarfs going the other?' said Carrot.

'Now there's a parade you don't want to miss,' said Nobby.

'What's wrong?' said Angua.

Carrot waved his hands vaguely in the air. 'Oh, dear. It's going to be dreadful. We must do something.'

'Dwarfs and trolls get along like a house on fire,' said Nobby. 'Ever been in a burning house, miss?'

Sergeant Colon's normally red face had gone pale pink. He buckled on his sword belt and picked up his truncheon.

'Remember,' he said, 'let's be careful out there.'

'Yeah,' said Nobby, 'let's be careful to stay in here.'

To understand why dwarfs and trolls don't like each other you have to go back a long way.

They get along like chalk and cheese. Very like chalk and cheese, really. One is organic, the other isn't, and also smells a bit cheesy. Dwarfs make a living by smashing up rocks with valuable minerals in them and the silicon-based lifeform known as trolls are, basically, rocks with valuable minerals in them. In the wild they also spend most of the daylight hours dormant, and that's not a situation a rock containing valuable minerals needs to be in when there are dwarfs around. And dwarfs hate trolls because, after you've just found an interesting seam of valuable minerals, you don't like rocks that suddenly stand up and tear your arm off because you've just stuck a pick-axe in their ear.

It was a state of permanent inter-species vendetta and,

-like all good vendettas, didn't really need a reason any more. It was enough that it had always existed.[5] Dwarfs hated trolls because trolls hated dwarfs, and vice versa.