“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.

The breach in the wall was sixty feet wide, Hereward reckoned, and though bricks were still tumbling on either side, there were none left to fall from above. The Sea-Cat could be safely towed inside, to disgorge the pirates upon the wharves or, if they had rotted and fallen away, to the quay itself.

Hereward looked aft. The xebec was some hundred yards behind, its lower yardarms hung with lanterns so that it looked like some strange, blazing-eyed monster slowly wading up the gorge, the small towing craft ahead of it low dark shapes, lesser servants lit by duller lights.