Then, seeing the Genoese observing him with surprise, he continued:
"It is a simple tale, Captain.... A Dacian, calling himself Urban, asked audience of me one day, and being admitted, said he was an artificer of cannon; that he had plied his art in the foundries of Germany, and from study of powder was convinced of the practicality of applying it to guns of heavier calibre than any in use. He had discovered a composition of metals, he said, which was his secret, and capable, when properly cast, of an immeasurable strain. Would I furnish him the materials, and a place, with appliances for the work such as he would name, I might collect the machines in my arsenal, and burn them or throw them into the sea. I might even level my walls, and in their stead throw up ramparts of common earth, and by mounting his guns upon them secure my capital against the combined powers of the world. He refused to give me details of his processes. I asked him what reward he wanted, and he set it so high I laughed. Thinking to sound him further, I kept him in my service a few days; but becoming weary of his importunities, I dismissed him. I next heard of him at Adrianople. The Sultan Mahommed entertained his propositions, built him a foundry, and tried one of his guns, with results the fame of which is a wonder to the whole East. It was the log of bronze Count Corti saw on the road—now it is here—and Heaven sent it to me first."
"Your Majesty," returned the Genoese, impressed by the circumstance, and the evident remorse of the Emperor, "Heaven does not hold us accountable for errors of judgment. There is not a monarch in Europe who would have accepted the man's terms, and it remains to be seen if Mahommed, as yet but a callow youth, has not been cheated. But look yonder!"
As he spoke, the Janissaries in front of the gate mounted and rode forward, probably a hundred yards, pursued by a riotous shouting and cracking of whips. Presently a train of buffaloes, yoked and tugging laboriously at something almost too heavy for them, appeared on the swell of earth; and there was a driver for every yoke, and every driver whirled a long stick with a longer lash fixed to it, and howled lustily.
"It is the great gun," said Constantine. "They are putting it in position."
Justiniani spoke to the men standing by the machines: "Make ready bolt and stone."
The balistiers took to their wheels eagerly, and discharged a shower of missiles at the Janissaries and ox-drivers.
"Too short, my men—more range."
The elevation was increased; still the bolts fell short.
"Bring forward the guns!" shouted Justiniani.