Several recently press-ganged metal ships were designated scrap. Piece by piece, they were taken apart. Thousands of men and women swarmed over them: the regular dock work was relegated to skeleton crews, and huge day rates were offered to the city’s casual workers. The iron exoskeletons of warships, the girders and innards of steamers, the enormous tempered metal masts, were stripped. The vessels were peeled and disemboweled, and all the tons of metal were shipped by barge and airlifted by convoys of dirigibles to the factories.

The avanc’s harness would sport girders and screws still marked with the scars of previous service. In foundries, iron too ruined to be reshaped was melted down.

Armada was not a city with a grand tradition of thaumaturgy. But there were competent metallo-thaumaturgists among the pirates, and gangs of them entered the factories. They worked closely with the engineers, mixing arcane compounds in great vats to strengthen and lighten and bind the metal. At last, some of Garwater’s stores of rockmilk were used. The liquid was brought in vials, vastly heavy and dense. When it was unstoppered it gave off disorienting vapors like spice and oil. It moiled behind the glass, a cold mother-of-pearl.

The metallo-thaumaturges would add measured drops of it as they mouthed incantations and passed their hands over the melting metal in puissant currents, charging it and sealing it.

And after rolling out the metal and hammering and more arcane procedures, the components of the avanc’s bridle began to be dragged by submersibles into place below the city. An army of divers worked on them with chymical welders that sputtered colorfully in the water, and wielded hammers and wrenches with water-slowed motions.

It was an incredible, sudden industry.

The chains were anchored in the bases of five ships. The Psire of Booktown; Jhour’s Saskital; the big steamer Tailor’s Moan, the capital ship of Bask; the Wordhoard in the haunted riding; and Garwater’s Grand Easterly. From the keels and sloping flanks of each of these old, massive ships curved an arc of iron the size of some great church doorway, bolted on and veiled thaumaturgically. And from each of those stretched links the size of boats.

The guard sharks were let free. It seemed impossible that the chains had ever been hidden. The rumors spread-about what had been done before and what might happen now. It was said that Bask riding had tried to sever the chain below their vessel, to scupper Garwater’s plans, but that it had been too strong, too massive, too protected by puissant charms.