Andy McNab - Recoil

Crucial came in, pushing out pills from a foil blister pack and getting them down his neck, dry. He was taking quite a cocktail. Each pack had rows of white, blue and yellow capsules.

His hair and eyebrows were still caked with dry mud, but sweat had shifted most of it from his face. His wound leaked through the dressing and was turning the mud round it a darker red.

There was no time to fuck around. 'Crucial, I want the guys to mix all this lot.' I slapped the stacks of fertilizer. 'I want everything they've already mixed, and this lot, down by the river, at the valley entrance. Start dumping it on the right-hand side as we look at it from here, yeah?'

Crucial wrinkled his nose at the smell. Maybe he'd never been in here. 'It reminds me of a cake Sam made at the mission one Christmas when I was a kid. What's the plan?'

I picked up a reel of detonation cord. 'A welcome mat they won't forget. The world's biggest fuck-off claymores.'

The diamonds in his teeth glinted, even in the gloom. 'Playtime!' He was actually enjoying this.

I shook my head. 'There's fuck-all wrong with you, is there?'

Crucial smiled some more. 'What have I got to lose?'

I didn't have time to answer. 'I want all the miners to drop off their picks and shovels. Anything metal – pots, pans, the lot. I want these claymores big and I want them dangerous. If they won't do it, fucking stick a barrel or two up their arses. They'll get the message. Can I get some cover down there?'

He nodded.

I set off as fast as I could, which wasn't very. I was staggering again by the time I was back on the valley floor, my nose full of marzipan fumes, my arms full of AK, a reel of det cord, and a wooden box of HE. My head still had a regimental band drumming away inside, and to top it all, I was finding it harder to lift my boots out of the mud. My feet felt like fully loaded bergens.

Crucial screamed at the miners and the ANFO mixers behind me. Sam bounced from sangar to sangar checking arcs. Once done, the guys would stand down, but stay in their positions, with all their kit on, ready for an instant stand-to.

I passed the re-entrant where the Nuka mob were huddled. There was no sign of Tim but I was sure he'd be running around in there with the rest of his crew. A bunch of porters had now joined the gathering, some with their families. It looked like the walking wounded were being coaxed into taking cover in the mine shafts; the switched-on ones were already there, like Londoners down the tube during the Blitz. They weren't protesting: they knew as well as we did that the shit was about to hit the fan.

Sam's kids looked much the same as they had when I first saw them. They sat together, wrapped in blankets. Like Sunday, they stared at everything going on around them, but their expressionless eyes told me they were on another planet. Whatever it was called, it must have been a dull and scary place.

My claymore plan was simple – it had to be, because there was no time. And simple equals it's more likely to work.

I was going to make just two giant claymores with the ANFO and as much metal as I could muster, then site them so that anyone coming along or across the river would get the good news early.

There's nothing sophisticated about a claymore. Even the nice factory-made American ones are just an explosive charge shaped to direct a mass of steel ball-bearings to the front of the HE like shotgun pellets. They are rated as small anti-personnel mines, but the ones I had in mind were going to be big anti-everything mines.

I kept on towards the valley entrance, fighting the lethargy in my legs and the pain in my head. Maybe it wasn't down to dehydration. Maybe it was because I couldn't get out of my head what Sam had said about Standish's big Swiss cheese and the Chinese connection.

Behind me, a human train was forming, each truck loaded with plastic fertilizer sacks of ANFO.

I shouted up at the guys in the sangars as I made my way to the valley mouth. I wanted them to know exactly who was moving into their arcs. 'I'm going there, over there!' I gave them a thumbs-up and a couple waved.

I wanted two holes, not too deep, one on each side. The theory was that when the claymores were detonated, a shallow pit would contain the majority of the main force of the explosion, and send the shrapnel that had been packed in front scything into the advancing enemy.

Problem was, ANFO is low explosive. The combustion rate is slow, under six thousand metres per second, which is why it is used in mines and to make craters. High explosives, like the stuff in the box I had under my arm, has almost instantaneous combustion, with a shockwave that can be directed at the enemy.

With more HE, I could have built the claymores with oil drums – placed the HE at the bottom, packed the metal on top, and pointed them towards the killing area. But with low explosive, I had to try to contain the detonation and focus it in one direction. It would still take a huge lump out of the hill, but with luck I could direct most of the blast forward – smack into the LRA.

I had never made one of these things with low explosives before – it had always been HE. But it seemed logical that there still had to be a buffer between the explosive and the metal I hoped to be piling in front of it – in this case a mud wall at least a foot thick. Without one, the high detonation temperatures would just melt the metal in front of it, producing a big blob of white-hot molten alloy – great if you wanted to penetrate a tank, but not if you wanted to devastate an area.

My hope was that a buffer would give the claymore's gases a nanosecond to build pressure before they broke through and blasted bits of metal into LRA flesh and bone across the killing ground. Of course, some of the energy would be converted into a fucking big crater as well, but I hoped I'd direct at least 60-70 per cent of the pressure wave outwards, towards the targets.

Fuck it, there was only one way to find out.

I scrambled up and down the high ground on the right side of the entrance. The ideal hole would be at least three metres above the valley floor for a better spread of blast over the killing ground.

I was also looking for the perfect angle: when the thing was detonated, I wanted the shrapnel to blast the two hundred or so metres across the front of the valley, but also along the riverbank towards Nuka, and over the river into the trees.

I aimed to do exactly the same on the opposite side, which would cover the way Silky and I had left earlier, upstream. Just as the beaten zones of the GPMGs lay over each other like circles in a Venn diagram, when these things kicked off nothing in the killing ground would survive.

I found a dugout rather than a shaft, which couldn't have been better. It looked like they'd stopped digging when they'd encountered a different, grey-coloured rock, or maybe just got bored. Whatever, the shallow cave would contain and direct the explosion perfectly. Had it been a shaft, a lot of the force would have been dissipated into the ground.

It looked like someone's home. There were the embers of a cooking fire inside a small ring of rocks, and the usual aluminium pot. A couple of blankets lay on the ground. Whoever they were, they'd have to visit an estate agent after I'd finished today's makeover.

The cave was about three metres wide and a couple high at the entrance, sloping down two metres towards the back. I lay down at its centre and checked what arcs I'd achieve with the explosive. As the combustion looked for the easiest way out, it would initially go forward, then spread left and right, up and down – a bit like shotgun pellets do so that men in tweed can bring down pheasants and think themselves excellent shots.

Sweat poured down my face, and all my joints were aching as if I had flu. To top it all, I had a stinging lump on my left forearm that I kept scratching through the material. I was tempted to keep lying there and tune right out.