Rewrite That Witch
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Chapter 567: Explosive Shells

The roar crossed the western suburbs like a physical wave.

From the city wall, civilians watched through their hands or through borrowed telescopes, craning toward the Misty Forest where the First Army had sealed every entrance. The test ground was far enough that the explosion was a visual event before it was a sonic one — the flash first, then the pressure hitting the chest, then the sound rolling over the wall like something enormous turning in its sleep.

Roland noted the crowd on the wall and filed away the obvious conclusion. We need a dedicated test range. Somewhere without an audience.

“Second volley ready, Your Majesty!”

“Everyone to the bunker.” He scanned the field and waved his arm. “Sound-off when the ground is clear, then begin the count.”

The 152mm howitzer shells were a different class of problem from anything that had come before. Solid shot was engineering; this was clockwork with consequences. The impact detonator demanded not just precision but reliability across a cascade of interlocked systems — and in three days of testing, not a single shell had successfully detonated on impact. Worse, on the second day, one had exploded at the muzzle, which had ended that particular barrel’s testing life early. The trenches Roland had ordered dug around the perimeter had done their work; no casualties, only a few ruptured eardrums that Nana healed before the day was finished.

Anna was producing four test shells per day. The math was ungenerous.

“Does this thing actually explode when it strikes an enemy?” Agatha peered past the edge of the bunker with the enthusiasm of someone constitutionally unable to watch an experiment passively. “Anna told me the mechanism — a few pieces of sheet metal. It has no mind. How does it know what it’s hitting?”

She was, Roland had noticed, the witch most likely to appear uninvited at weapons tests. She would put down whatever she was doing at the chemical plant and walk over, because the possibility of watching something explode was simply more compelling than anything else on her schedule.

“It doesn’t explode on contact with enemies specifically — it explodes when it lands in their position,” Roland said. “Which is a distinction the fuse has to be built to enforce. An impact detonator without a safety system is a catastrophe waiting to happen — it could fire in the transport wagon, drop it from any height, it goes off. Three separate safety systems, all of which have to work in sequence.”

Three layers. Each one was necessary. Each one had taken days of adjustment to get right.

The first was logistical: fuses and shells transported separately, installed at the artillery just before loading. The fuse itself was a cone-shaped device the size of a fist, threaded to screw into the top of the shell. The warhead was packed with double-base chemical powder — stable material that would not ignite without a detonator, which made the supply chain manageable.

The second was the inertia safety inside the fuse. A gate-lock mechanism: at rest, a stiff spring held the lock cylinder immobile. At the moment of firing, the tremendous rearward inertia drove the cylinder back against the spring, compressing it past its threshold and releasing the latch. The spring calibration had consumed most of the first two days — too stiff and the recoil was insufficient; too loose and safety was compromised. Eight rounds of test firing, careful measurements, adjustments. Now they had numbers they trusted.

The third was the centrifugal primer-detonator. This was the heart of the problem.

A half-circle iron plate, coin-sized, embedded in the fuse body. The detonator rode on this plate, normally held at an oblique angle by a spring — misaligned with the firing pin above and the charge below. The geometry was the safety: even a drop from height would not bring all three components into line. Only after the inertia safety released its latch could the iron plate move at all. And movement required something the falling shell could not provide: rotation.

The rifled barrel spun the shell at high speed. Under that centrifugal force, the oblique iron plate began to migrate toward upright — the way a spinning top finds its axis, gradually, through the physics of angular momentum. The process took two hundred to three hundred meters of flight, which meant the shell was well clear of the muzzle before it armed itself. Tree branches, barrel obstructions, anything in the first segment of trajectory: irrelevant. The shell would not arm.

Once upright, the detonator aligned with the firing pin and the charge. Impact drove the pin home. The detonator fired into the charge. The charge detonated the warhead.

And if the shell failed to detonate — as they kept failing — the absence of centrifugal force would let the spring drive the plate back to its tilted position, making the dud safe to handle. Safer, anyway. If the enemy recovered a failed shell and tried to disassemble it, the mechanism that made it work was also the mechanism that defeated any attempt to replicate it through disassembly alone.

“Prepare to fire. Countdown at five.”

The observer’s voice carried across the cleared field. The lanyard was gathered in, taken up to tension, the gunner’s body angled into position at the bottom of the trench.

“Fire!”

The world compressed and released. Soil particles pattered against Roland’s collar from twenty meters away. Through his covered ears he felt the discharge in his bones — not heard, just felt, a vibration that moved up through the ground.

A pause. Then Lightning’s voice through the Sigil of Listening in Nightingale’s hand: “Located the impact point. No detonation. Repeat — no detonation.”

“Understood. We’re coming.”

Agatha looked at the space where the shell had landed. “Again.”

“Failure is ordinary in testing,” Anna said, already opening her notebook. “Once we understand the direction of the problem, reliable mass production follows.”

“Well said.” Roland touched the back of her head once, light and brief. “And with Summer and Sylvie, the diagnostic speed is something that would have been unimaginable six months ago.”

In another era of engineering — his own, the one he still thought in sometimes — thousands of shells might be expended to isolate a fuse failure mode. He had Summer’s playback ability, fixed to the exact moment of impact, and Sylvie’s sight that could examine the interior of the phantom shell as though the casing were glass. Eight rounds to calibrate the inertia spring. The pace was extraordinary by any standard.

They reached the impact crater. Anna raised Blackfire and cut the fuse — clean, precise, rendering the payload inert — and the soldiers collected the shell for recycling. Metal and powder both. Nothing wasted.

“Summer,” Roland said.

“Yes, Your Majesty.”

The playback appeared in the air above the impact point: a shell in the last instant of its descent, the fuse detail visible down to the hairline gaps between components. Summer held it at the precise moment of failure, absolutely still, as though time itself was waiting for Sylvie’s assessment.

Sylvie examined it without touching it, her gaze moving through layers of metal and spring and alignment.

They would have an answer before sunset.

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