High-speed lethality was not achieved by raw explosive violence. It was achieved by the hermetic holding of expanding gas behind an obedient projectile mass.
Inside the clean assembly shed behind Master Caleb’s woodshop, three long frame stand tables were laid out in an orderly munitions production line.
The room smelled of hot beeswax, melted sheep fat, freshly turned oak shavings. The dry, stone tang of corned blackpowder.
Giles Croft stood at the head of the first table, his fine measuring tongs open.
In his hand, he held a wooden metal tube freshly turned on Caleb’s water-powered pedal lathe.
The block was carved from seasoned white oak, four inches in width and three inches deep. The bottom face was dished inward like a shallow saucer, designed to cup the expanding propellant gas. The upper face was recessed to seat a circular felt wadding pad.
“Convex gas cup,” Giles murmured, verifying the rim with his measuring tongs. “Three point nine eight inches width. A limit of two hundredths of an inch.”
Caleb Thorne-Wood stood beside the lathe, covered in fine oak dust, his sleeves rolled to his broad shoulders.
“Turned twenty of them since dawn, Lord Giles,” Caleb reported, holding up another finished cup. “White oak heartwood, dried for two full years behind the saw-pit. The grain runs parallel to the bore axis. So the cup won’t split along the rings when the powder blows.”
“The wood must not split,” Giles confirmed. “When five pounds of corned blackpowder deflagrates behind it, chamber pressure spikes to twelve thousand pounds of pressure. The concave bottom flexes outward, pressing the wooden lip tightly against the bronze-iron bore. That forms an airtight gas seal.”
Kenneth Drake stood at the second table, inspecting the finished wooden sabot cups with quiet, skilled scrutiny.
“In the royal legions, artillerymen packed giant crossbow canisters with loose gravel and animal fat rags,” Kenneth said. “Half the powder gas blew past the rocks through the gaps, throwing burning cloth into the grass and leaving the stones to dribble fifty paces out.”
“That’s blow-by,” Giles said. “Bore blow-by wastes forty percent of propellant energy and induces severe gas cutting along the chamber walls. The sabot cup ensures one hundred percent moving transfer.”
Master Borin brought up a short cutaway section of bronze test metal tube from the scrap pile.
He set the four-inch tube on the bench, slid a turned sabot cup into the throat. Then he pressed a heavy wooden rammer against the cup with his shoulder.
“Look at that fit,” Borin said, pointing with a dirty thumbnail. “When the wood flares out, the felt disk behind it compresses to half its thickness. It squeezes the hot sheep fat out through the pores, wiping the metal wall clean as a whistle. You could shoot gravel through it and not scratch a hair of bronze.”
“The felt also prevents shot bridging,” Giles noted, examining the wadding. “If loose iron pellets are driven directly against the powder charge, inter-particle friction causes the shot to lock together in an arch, producing nearby pressure spikes that bulge gun tubes. The felt acts as a shock-absorbing piston face.”
Kenneth Drake nodded, his tactical instincts aligning with the clockwork reality. “A cushion that turns chaos into a straight push.”
“Exactly,” Giles said.
At the second table, Master Borin Bronze-Lung and Toby Karr were preparing the moving penetrators.
Borin had spent two days in the foundry yard casting iron shot using gang molds. Split cast-iron plates carved with dozens of ball-shaped cavities, clamped together and poured with molten mountain pig-iron.
The molds had been chilled with cold river water to harden the metal.
The resulting pellets were three-quarters of an inch in width, solid chilled iron the size of small walnuts, fully free of air holes.
“Chilled iron,” Borin said, rolling a handful of black spheres across the table with a metal clatter. “Cooled fast in water to form white iron hardened carbon-iron. Hard as glass. They won’t flatten against an iron breastplate like soft lead. They punch straight through.”
Toby Karr sat on a three-legged stool with a tuned bronze balance scale and an iron scoop.
Beside Toby sat a wooden counting board, drilled with exactly three hundred and twenty circular holes arranged in nested rings.
The apprentice land-mapper scooped a heap of chilled iron pellets onto the board. He swept them across the surface with a cedar batten until every hole held a single sphere.
“Three hundred and twenty shot counted, Lord Giles!” Toby called out, tilting the board to dump the pellets into a waxed canvas cartridge envelope. “Eighteen pounds of iron per round, dead on the mark!”
“Verify the weight on the beam scale,” Giles instructed.
Toby set the filled canvas metal tube on the brass pan. The balance weight balanced with a clean, level pointer.
“Eighteen pounds zero ounces,” Toby confirmed proudly.
At the third table, Sister Teresa was head over the sealing process with the calm, careful devotion of an apothecary preparing holy unguents.
On a small charcoal fire bowl sat an iron cooking pot filled with melted sheep fat and yellow beeswax.
Beside the cooking pot sat piles of circular felt disks, punched from heavy woolen blankets salvaged from the winter stores.
Teresa used iron tongs to dip each felt disk into the warm, fragrant animal fat. That let the excess grease drain before pressing the soaked pad firmly into the wooden sabot cup.
“Sealed with fat and clean wool,” Teresa said, smoothing the edges of the wadding with her thumb. “The fat softens the powder fouling. The wool wipes the iron clean as the shot leaves the tube.”
“The animal fat acts as a high-pressure lubricant,” Giles noted, nodding in test. “Under burning heat, the grease vaporizes, coating the bore and keeping sulfur residues soft and pliable. It allows twenty in a row rounds without bore washing.”
Teresa looked up, her dark eyes solemn in the lantern light. “May each pellet find only the breast of the tyrant who comes to burn our homes. We fashion these vessels not for wrath, but to keep the innocent alive beneath the stone.”
Kenneth Drake picked up one of the completed canvas cartridges, weighing it in his gloved palm.
The round was bound in spiral-wound copper wire. It was sealed with red pine pitch, and fitted with an iron carrying loop.
“A bucket of iron hail wrapped in canvas,” Kenneth said softly. “One blast through the outer gatehouse murder holes, and sixty raiders in mail armor will become red mist on the floor.”
“Area crushing weight thickness,” Giles corrected, noting the completion of round number ten in his ledger. “The probability of an infantry soldier escaping moving impact within a twenty-four-foot cone at fifty yards is less than zero point zero two percent.”
By mid-afternoon, twenty complete Canister Sabot rounds were finished, sealed, and racked in the ammunition magazine beneath the gatehouse stronghold.
Each round was stored in a single cedar pigeonhole lined with dry wool felt to protect the paper cartridges from dampness.
Beside the shot cartridges sat twenty tube-shaped canvas powder charges, each holding four pounds of screened, corned blackpowder, fitted with linen pull-tabs for rapid loading.
Lady Millicent walked through the magazine, holding a small brass lantern.
“Inventory reconciled,” Millicent reported, clicking her glasses against her apron. “Three hundred and sixty pounds of chilled iron shot. Eighty pounds of corned blackpowder. Twenty wooden sabot cups. Total cost: forty-two gold sovereigns in raw commodities.”
“A modest waste for total gate security,” Giles replied, closing his field notebook.
Kenneth Drake stood by the open door of the magazine, his ten-foot pacing rod resting against the stone frame.
The old sapper took a deep breath of the mountain air, then stopped.
His eyes narrowed, gazing northward toward the high granite crags.
The wind had died fully. The sky was turning a hard, frozen white, pale as bleached bone. A strange, dead hush fell over the valley, the kind of silence that preceded a crushing snowfall.
Then, from five leagues north along the river gorge, came a sound.
It wasn’t thunder.
It was a dull, rhythmic, bone-jarring THUD-THUD that shook through the frozen ground, rattling the tin cups on the workbench.
Toby Karr froze, a half-finished sabot cup dangling from his fingers. “What’s that?”
Kenneth stepped out onto the narrow high walkway, looking up at the high northern ridge.
High on the timbered crest overlooking the river, two miles distant, the dark pine canopy began to sway and crack.
Through the trees emerged a huge shape.
It was a massive wooden siege engine, thirty-five feet high, built of raw, stripped pine logs bound in blackened iron plates. The tower rolled on eight massive wooden cartwheels, each six feet tall and rimmed with spiked iron tires.
Pushed by four teams of armored draft oxen, the monstrous machine groaned as it rolled over the crest, its forward face protected by a sloping mantlet of green ox-hides and hammered iron sheets.
Behind the first tower rolled a second, matching titan of timber and iron.
And between the two towers, hauled by forty screaming, shouting outlaws clad in boiled leather and horned iron helmets, marched three huge tree trunks tipped with cast-iron ram heads.
The Broken Horn army had arrived at the northern ridge.
A harsh, brass war-horn sounded from the heights. A screeching, clashing blast that echoed off the canyon walls like the scream of a wounded beast.
Five hundred voices took up the roar, banging broadswords against notched iron shields in an ear-splitting rhythm that rolled down the valley like an avalanche of iron.
Kenneth Drake reached back, drawing his trench-sword with a slow, metal rasp.
His scarred face was fully calm.
“Warlord Bronn has reached the outer edge,” Kenneth said quietly. His voice carried clearly to every man on the stronghold. “Five hundred axes, three rams, and two towers.”
Giles Croft stepped onto the narrow high walkway, pulling his brass slide rule from his vest pocket.
He looked across the frozen plain toward the towering wooden machines on the ridge, then down at the twenty-foot water moat and the twin bronze-iron blunderbores mounted in the gatehouse casemates.
“Hostile raid event: Wave One started,” Giles said in his standard deadpan flat voice. “Their wheel loading exceeds forty-two pounds of pressure on frozen ground. Let’s proceed with the high-speed scattering test.”