Bullet! The word penetrated Troy like a bullet itself. Of course! The Sten-guns would be useless without a large supply of first class ammunition. He had been so intent on the gun itself that he had never considered the thousands, hundreds of thousands, of cartridges they would need. Cartridges of a kind he had yet to see here. The clues had been under his nose ever since he had arrived, but he had been too stupid to notice them. He had seen many different kinds of guns, smoothbore, rifled, muzzle loading, pin fire and percussion cap — a great variety — but none of them were capable of easy loading or of automatic fire. Ammunition. There had been no sign of cartridges or gunpowder in McCulloch's factory. An operation like that could not be easily hidden. Which meant that although the guns were manufactured in Richmond the ammunition wasn't. Where could the necessary bullets be made?
In a government armoury, of course.
The newcomer was still talking, answering questions. Troy waited, kneading his knuckles impatiently, then finally broke in.
'Mr Copeland, I'm sorry to interrupt, but you said something a moment ago about a new kind of bullet being manufactured in Harper's Ferry?'
'That's right, that's what Mr Cook told me, and he's not the kind of man who would lie about a thing like that. They are making these bullets in Hall's Rifle Works, out there on that island in the Shenandoah. Secret, guards all around. You can't get near the place at all.'
'Did Mr Cook describe the bullet to you, tell you anything about it?'
'Did more than that. Said that this was so secret it had to be important. He told me to tell John Brown about it, and I did that. Something else he did, he got hold of some empty shell casings when they was sweeping out, ones that had broke. For me to show to John Brown.'
'Could you describe them?' Troy asked, forcing his voice to remain calm.
'Do better than that. Let you look at one. Kept one for myself.'
He rooted around in his trouser pocket, frowned, then put his hand in the other pocket.
'Don't think I lost it. Got it here some place. Yes, I knew it, here.'
Troy looked at the split shell casing resting on the palm of his hand, cracked in the drawing, it looked like. A 9mm Parabellum, it could be nothing else; he had fired enough of them to know. Ringed at the base and punctured for the insertion of the percussion cap.
'That's very interesting,' he said, passing it back. 'And you'll be guiding Mr Meriam back to join the others?'
'Sure will. First thing in the morning.'
'I would like to volunteer to go with you. May I?'
'John Brown can use every man he can get.'
'I'm glad to hear that,' Robbie Shaw broke in, speaking for the first time — though he had been listening intently. 'If he can use one volunteer he can use another. I'm going along as well.'
He was looking straight at Troy as he said it, and permitted a quick touch of a smile to move his lips. There was much talk and excitement after that, and only later did Troy have a chance to draw the Scotsman aside.
'What did you do that for?' Troy asked. 'This is no game now. People are going to get killed.'
'It never was a game — but it has been a puzzle. You know a lot of things that you haven't told me, though tonight you did tell me that this new ammunition has a good deal to do with you or the colonel — or both. The way you jumped when Copeland mentioned it. Are you going to let me know now what this thing is all about?'
'No. But I will tell you to get out while the going is good. I have to go to Harper's Ferry, but you don't. Please, Robbie, take my word for it. No good will come of this.'
'I'll take your word only when you let me know what this entire matter is all about. Can't you tell me what you were looking for in McCulloch's factory? You must have found something there if you tried to burn it down.'
Troy considered it. He had proof now that McCulloch was making the guns, and was also somehow involved in a conspiracy to manufacture the ammunition in a government armoury. This meant that a number of people knew what was happening and it was no longer necessary to keep the Sten-gun a secret. All he had to leave out was the fact that he had followed McCulloch here from the future.
'All right. It's only fair that you know now. I'm a government agent following McCulloch. Not only did he commit those murders I told you about, but he stole the drawings for a highly secret and deadly weapon. He believes firmly that war will soon come between the states, and he must have obtained the aid of other, like-minded Southerners. He is making the gun at his factory — I found a piece from it. But he has no ammunition works there, and this gun uses a special type of bullet. With a casing just like the one I was holding. And that is the puzzle. These cartridges are being made in a government armoury. Yet I can guarantee you — the government knows nothing about this.'