Many hours later, Fury stood on the quarterdeck and looked down at Hereward as he took his place aboard the boat that was to transfer him to the Strongarm. She gave no sign that she viewed him with any particular affection or fondness, or indeed recalled their intimate relations at all. However, Hereward was relieved to see that though the lanterns in the rigging cast shadows on her face, there was only the one leoparde patch there and her nails were of a human dimension.

Fitz stood at her side, his papier-mâché head held at a slight angle so that he might see both sky and boat. Hereward had managed only a brief moment of discourse with him, enough to impart Fury’s nature and to tell him that she had seemed to take the disclosure of their potential enemy with equanimity. Or possibly had not heard him properly, or recalled it, having been concerned with more immediate activities.

Both Sea-Cat and Strongarm were six miles up the gorge, its sheer, grey-white limestone walls towering several hundred feet above them. Only the silver moon was high enough to light their way, the blue moon left behind on the horizon of the open sea. Even so, it was a bright three-quarter moon, and the sky clear and full of stars, so on one score at least the night was ideal for the expedition.

But the wind had been dropping by the minute, and now the air was still, and what little sail the Sea-Cat had set was limp and useless. Strongarm’s poles were bare, as she was already moored in the position Fitz had chosen on their preliminary exploration a month before, with three anchors down and a spring on each mooring line. Hereward would adjust the vessel’s lie when he got aboard, thus training the mortar exactly on the Sea Gate, which lay out of sight on the other side of the northern wall, in the next turn of the gorge.

In consequence of the calm, recourse had to be made to oars, so a longboat, two gigs and Annim Tel’s skiff were in line ahead of the Sea-Cat, ready to tow her the last mile around the bend in the gorge. Hereward would have preferred to undertake the assault entirely in the small craft, but they could not deliver sufficient force. There were more than a hundred and ninety pirates aboard the xebec, and he suspected they might need all of them and more.

“High water,” called out someone from near the bow of the Sea-Cat. “The flow has ceased.”

“Give way!” ordered Hereward, and his boat surged forward, six pirates bending their strength upon the oars. With the gorge so narrow it would only take a few minutes to reach the Strongarm, but with the tide at its peak and slack water begun, Hereward had less than a quarter-hour to train, elevate and fire the mortar.

Behind him, he heard Jabez roar, quickly followed by the splash of many oars in the water as the boats began the tow. It would be a slow passage for the Sea-Cat, and Hereward’s gig would easily catch them up.

The return journey out of the gorge would be just as slow, Hereward thought, and entailed much greater risk. If they lost too many rowers in battle, and if the wind failed to come up, they might well not make it out before the eagre came racing up the gorge once more.

He tried to dismiss images of the great wave roaring down the gorge as he climbed up the side of the bomb vessel and quickly ran to the mortar. His crew had everything ready. The chest was open to show the special bomb, the charge bags were laid on oil-cloth next to it and his gunner’s quadrant and fuses were laid out likewise on the opposite side.

Hereward looked up at the sky and at the marks Fitz had sorcerously carved into the cliff the month before, small things that caught the moonlight and might be mistaken for a natural pocket of quartz. Using these marks, he ordered a minor adjustment of the springs to warp the bomb vessel around a fraction, a task that took precious minutes as the crew heaved on the lines.

While they heaved, Hereward laid the carefully calculated number and weight of charge bags in the mortar. Then he checked and cut the fuse, measuring it three times and checking it again, before pushing it into the bomb. This was a necessary piece of misdirection for the benefit of the pirates, for in fact Fitz had put a sorcerous trigger in the bomb so that it would explode exactly as required.

“Load!” called Hereward. The six pirates who served the mortar leaped into action, two carefully placing the wadding on the charge bags while the other four gingerly lifted the bomb and let it slide back into the mortar.

“Prepare for adjustment,” came the next command. Hereward laid his gunner’s quadrant in the barrel and the crew took a grip on the two butterfly-shaped handles that turned the cogs that would raise the mortar’s inclination. “Up six turns!”

“Up six turns!” chorused the hands as they turned the handles, bronze cogs ticking as the teeth interlocked with the thread of the inclination screws. The barrel of the mortar slowly rose, till it was pointing up at the clear sky and was only ten degrees from the vertical.

“Down one quarter turn!”

“Down one quarter turn!”

The barrel came down. Hereward checked the angle once more. All would depend upon this one shot.

“Prime her and ready matches!”

The leading hand primed the touch-hole with fine powder from a flask, while his second walked back along the deck to retrieve two linstocks, long poles that held burning lengths of match cord.

“Stand ready!”

Hereward took one linstock and the leading gunner the other. The rest of the gun crew walked aft, away from the mortar, increasing their chances of survival should there be some flaw in weapon or bomb that resulted in early detonation.

“One for the sea, two for the shore, three for the match,” Hereward chanted. On three he lit the bomb’s fuse and strode quickly away, still chanting, “four for the gunner and five for the bore!”

On “bore” the gunner lit the touch-hole.

Hereward already had his eyes screwed shut and was crouched on the deck fifteen feet from the mortar, with his back to it and a good handhold. Even so, the flash went through his eyelids and the concussion and thunderous report that followed sent him sprawling across the deck. The Strongarm pitched and rolled too, so that he was in some danger of going over the side, till he found another handhold.

Hauling himself upright, Hereward looked up to make sure the bomb had cleared the rim of the gorge, though he knew that if it hadn’t there would already be broken rock falling all around. Blinking against the spots and luminous blurring that were the after-effects of the flash, he stared up at the sky and a few seconds later, was rewarded by the sight of another, even brighter flash and, hard on its heels, a deep, thunderous rumble.

“A hit, a palpable hit!” cried the leading gunner, who was an educated man who doubtless had some strange story of how he had become a pirate. “Well done, sir!”

“It hit something, sure enough,” said Hereward, as the other gunners cheered. “But has it brought the Sea Gate down? We shall see. Gunners, swab out the mortar and stand ready. Crew, to the boat. We must make haste.”

As expected, Hereward’s gig easily caught the Sea-Cat and its towing boats, which were making slow progress, particularly as a small wave had come down from farther up the gorge, setting them momentarily aback, but heartening Hereward as it indicated a major displacement of the water in front of the Sea Gate.

This early portent of success was confirmed some short time later as his craft came in sight of the gorge’s terminus. Dust and smoke still hung in the air, and there was a huge dark hole in the middle of what had once been a great wall of pale green bricks.

“Lanterns!” called Hereward as they rowed forward, and his bowman held a lantern high in each hand, the two beams catching spirals of dust and blue-grey gunsmoke which were still twisting their way up towards the silver moon.