An eighteen-ton wooden siege tower didn’t advance on magical floating. It advanced upon eight seasoned ash axles resting in greased bronze wheel hubs.
Destroy the axle, and gravity did the rest of the demolition free of charge.
At first light in the blacksmith’s yard, Giles Croft sat at a low bench with his fine measuring tongs and a set of iron radius gauges.
Beside him, Master Borin Bronze-Lung and Master Duncan Stone-Splitter stood over an anvil. He was surrounded by the bright ringing music of three timed together sledgehammers.
The floor of the forge was stacked high with six-foot shafts of straight-grained white ash, seasoned in the drying kilns and shaved round to an exact two-inch width on Caleb’s lathe.
Giles picked up an unmounted warhead.
It wasn’t a barbed hunting broadhead or a needle-point arrow point. It was a solid, chisel-pointed metal tube of case-hardened mountain tool steel, an inch and a half in width and seven inches long.
The tip was ground to a steep sixty-degree chisel edge, hardened to a pale straw color in hot oil.
“Chisel shape,” Giles murmured, verifying the cutting angle with his brass protractor. “A pointed needle-point arrow glances off sloped oak mantlets or embeds itself in sapwood. A chisel tip behaves like a cold wedge. Upon impact at two hundred and forty feet per second, it concentrates nine hundred foot-pounds of striking force into a line contact barely an eighth of an inch wide.”
Borin cooled another glowing head in a tub of salt water, steam hissing into the rafters.
“White-hot from the fire, chilled in salted water,” Borin barked. He wiped sweat with his leather sleeve. “The skin is file-hard, but the core is soft iron to absorb the shock without snapping. If that chisel hits an oak wheel hub, it won’t stop until it comes out the other side.”
Duncan Stone-Splitter carried an armload of finished heads to the mounting bench.
“Mounted them with hot shrunk collars,” Duncan said, showing Giles the joint. “We heat the iron sleeve red-hot, slip it over the ash wooden peg, and cool it. The iron shrinks three-hundredths of an inch, locking the steel head to the wood without a single rivet.”
“Now check the shaft timber,” Giles directed, running his fingers along the grain.
Master Caleb Thorne-Wood stood by a sorting frame stand, tapping each ash pole with a wooden mallet.
“One hundred and forty poles brought in from the high ridge,” Caleb said. He set three aside into a discard pile. “I tossed twenty-two already. The wood looks clean to an untrained eye, but the grain runs off diagonally.”
“Grain run-out is total under axial shock,” Giles said, demonstrating the flaw to Toby Karr. “When twelve hundred pounds of twisting force slam against the tail nock, any slanted grain shears open along the annual rings. The bolt buckles inside the launch trough instead of flying. Keep the slope of grain under one in twenty.”
Toby ran his thumb along the smooth white wood, noting the straight growth rings.
“What about the tail fins?” Toby asked.
At the tail of each six-foot bolt, Toby was riveting three thin three-sided vanes of heat-softened copper sheet.
The copper fins were not mounted straight along the shaft axis. Giles had Toby offset each fin by exactly three degrees, forming a subtle helical spiral.
“Why the twist, Lord Giles?” Toby asked, tapping a tiny copper rivet with a ball-peen hammer. “Straight goose feathers make an arrow fly true enough.”
“An arrow weighs two ounces and flexes in flight,” Giles explained. “This bolt weighs nine pounds. At two hundred and forty feet per second, an unspun nine-pound metal tube develops wind-cutting precession and tumbles end-over-end after one hundred yards.”
He pointed to the angled copper fins.
“The three-degree spiral pitch forces the rushing air to exert a sideways twisting force on the tail. The bolt spins at forty turns a second in flight. Gyroscopic balance prevents yaw, increases flight path consistency by eighty percent, and ensures the chisel point strikes straight-across to the target.”
Toby nodded solemnly, carefully burnishing the copper edges with a river pebble.
Yet the first test that morning had not gone smoothly.
When Kenneth had loaded their first prototype directly onto the launch rail without a carriage guide, disaster followed.
The heavy copper fins had dragged against the bronze rail edge at release. The violent friction snapped one fin clean off and gouged the stock.
The unbalanced bolt had kicked sideways, tumbling wildly through the air like a broken spar before cartwheeling fifty yards into a frozen mud ditch.
Borin had cursed colorfully at the bent vane. Meanwhile, Kenneth retrieved the ruined shaft with a scowl.
Giles had not scolded them. He had simply measured the clearance tolerances on the launch rail.
“The fin span exceeds the stock trough width by three-eighths of an inch,” Giles had noted calmly, sketching a split-ring shoe on a scrap of shingle. “We need a sabot. A split wooden carrier that holds the projectile centered along the bore without allowing the metal fins to touch the guide walls.”
Caleb had turned fifty split-ring sabots from soft white pine on his foot lathe within two hours.
The two-piece pine cup wrapped around the rear shaft, locking the bolt true. Upon clearing the muzzle, wind pushback caught the flared lip of the pine cup, peeling the two halves outward and dropping them harmlessly to the ground. Meanwhile, the finned bolt flew free.
“Offering carrier shoes,” Giles told Toby, holding up the two wooden halves. “Cheap pine that takes the friction so the copper fins never contact the bronze rails.”
Captain Kenneth Drake walked into the shop, with four guards carrying heavy wooden crates.
Kenneth took a finished bolt from the rack, sighting down its six-foot length against the morning light.
He fitted the pine sabot cup around the tail, testing how smoothly the assembly seated in the greased springald trough.
He weighed the weapon in his hands. He felt the balance point resting exactly two feet behind the steel chisel head.
“This isn’t an arrow,” Kenneth said softly, his voice full of quiet respect. “This is an iron spear thrown by a machine. A man couldn’t throw this ten paces. But the springald will send it three hundred yards through the air.”
“Let’s verify end-post penetration with the sabot,” Giles said.
In the quarry yard outside, Duncan had set up a test block. Two solid baulks of four-inch cured white oak, spiked together and braced against the granite cliff.
Kenneth mounted the test bolt onto the south castle wall springald.
He turned the bronze winding crank until the ratchet sang its twenty-fourth click. He set the height screw to eleven degrees—the range for the two-hundred-yard marker.
“Line clear,” Kenneth called.
He pulled the lanyard.
THWIP-CRACK!
The springald kicked on its bronze casters. The pine sabot halves peeled away fifteen paces downrange, fluttering into the weeds.
The six-foot bolt flashed across the quarry floor like a streak of gray lightning.
KABOOM!
The impact was a bone-jarring blast.
The chisel head struck the eight-inch oak block dead center.
It didn’t stick. It punched clean through both four-inch timbers, splitting the seasoned grain in a shower of flying splinters, and buried itself four inches deep into the solid mountain stone behind the wood.
The oak block split along its entire length, falling to the ground in two smoking halves.
Duncan Stone-Splitter walked up to the cliff, whistling between his teeth. He reached out and touched the steel head wedged in the living stone.
“Punched through eight inches of white oak and bit the mountain,” Duncan whispered. “The siege towers on the ridge are dead timber walking. One shot to the wheel hub, and thirty-five feet of pine crashes into the mud.”
Giles walked over to the shattered oak block. He knelt down to inspect the jagged edges of the split timber.
He picked up a palm-sized sliver of wood that smelled sharply of pine resin and crushed oak fiber.
The violence of the impact was total. Nine pounds of hardened steel traveling at two hundred and forty feet per second didn’t merely push wood aside. It shattered cellular structure like dry pottery.
“Lord Giles?” Kenneth asked, watching him closely.
“Eight inches of cured oak,” Giles said quietly, his thumb rubbing the splintered grain. “If a projectile carries this much striking force through solid load-bearing timber, consider what happens to the men pushing behind the axle.”
Kenneth rested his hand on the handle of his short sword. “They’re raiders, Lord Baron. Killers who come to burn our granaries and slit our throats.”
“They’re also conscripts, vagabonds, and desperate laborers hired with stolen coin,” Giles replied. He stood up and dusting his trousers. “Our objective is to destroy the machines, Kenneth. Not to turn men into red mist for sport. When the siege begins, train every height screw directly on the wheel hubs and axles. When the timber collapses, the assault halts. Give them every chance to drop their shields and retreat before we sweep the field.”
Kenneth looked at the shattered target, his jaw tightening, before nodding solemnly. “Target the hubs only. Understood.”
“We rack fifty bolts in the north castle wall, fifty in the south,” Kenneth added. “Every gunner knows the cairn marks.”
By dusk, all one hundred Armor-Piercing Sabot Bolts were finished, balanced, and racked in the stone castle walls.
Each bolt sat in a single padded rack beside the springald carriages, its chisel point coated with animal fat grease to prevent rust.
Lady Millicent inspected the racks, recording the completion in her tally-book.
“One hundred bolts,” Millicent said, closing her book with a satisfied click. “Total commodity cost: twelve gold sovereigns in copper, charcoal, and tool steel. If each bolt destroys one enemy engine or disables an armored shock crew, our defensive return on investment exceeds five thousand percent.”
“Defense isn’t an investment, Millicent. It’s a working survival prerequisite,” Giles replied, cleaning his measuring tongs on a dry rag.
“A necessary distinction,” Millicent conceded with a faint smirk. “Yet survival with a balanced ledger is vastly preferable to an unbudgeted victory.”
Giles walked out onto the high stone aqueduct narrow high walkway. He enjoyed the sharp, crisp silence of the mountain evening.
The sky was clear, studded with cold, sharp stars. Below, in the settlement grid, forty cedar chimneys were breathing thin curls of blue woodsmoke into the twilight.
Beside him, Maeve Swift-Ear padded softly along the stone flags. Her large brass ear-trumpet was tucked beneath her arm.
The vulpine scout stopped suddenly.
Her red-furred ears twitched, rotating independently toward the high northern cliffs where the two-mile aqueduct met the mountain spring.
She lifted the brass trumpet to her ear. She pointed the flared bell toward Pier Thirty-Eight, two miles upstream.
“Maeve?” Giles asked quietly.
“Hush,” Maeve whispered, her body going fully rigid.
She adjusted the horn’s angle, listening through the brass tube with intense, hungry concentration.
“Water sounds,” Maeve said, her voice dropping to a trembling murmur. “Not the steady rush of the water chute. Splashing. Irregular footsteps wading through the channel two miles up.”
Giles stepped to her side, his gaze narrowing toward the dark shape of Eagle Peak. “Someone is inside the aqueduct channel?”
“Six men,” Maeve whispered, her keen ears picking up the faint sound shakes traveling down the stone arches. “Wading through the spring intake pool. They carry heavy glass jars that clink together. They’re moving toward the main water chute.”
Giles didn’t hesitate.
“The saboteurs from the fens,” Giles said with cold, razor-sharp certainty. “They have bypassed our road defenses and climbed the northern cliff to dump nightshade poison into the drinking grid.”
He turned back toward the gatehouse stairs.
“Kenneth, take eight archers and four men with clubs. We move to Pier Twelve right away.”