It was quite simple. There was no difficulty. The Prince had made certain of this before he left his nephew to wait for the two cylinders. But the men worked with great care, for they knew that in those two simple brass casings lay the vital secrets which were to transform the submarine dreadnoughts from lumbering, groping sea monsters into live, active, vicious creatures of offense. It was just within the hour when Leder von Bersac passed out of the dockyard gates bearing the two brass cylinders in his arms, and received the salutes of the sentries. He remembered the method with which the Captain-General had received them, and responded in similar fashion. He passed on hurriedly in the direction of the landing-stage. Twenty yards from the dock gates an expression of doubt crept into his eyes, as he caught sight of a military officer hurrying towards him from the direction of what looked like a miniature fortress. However, he gave no sign. He continued his way. He could already see the grey wall of the harbor ahead. But the man was rapidly overhauling him, and, in Von Bersac's mind, a calculation was going on as to whether he could reach his uncle's vessel before the officer came up with him. This calculation, however, did not prove to his satisfaction. He knew he would be intercepted before he reached his destination. And the thought strangely disturbed him. Just as he was about to step on to the landing-stage the officer reached his side and saluted. He spoke at once, and though his manner was perfectly deferential, it was quite decided. "Will Herr von Bersac favor the Captain-General with a visit at his headquarters before leaving? The Captain-General requests that he will make it convenient--at once. It is the formal matter of registering his visit to Borga." The dark eyes of the tall engineer dwelt for a moment upon the immobile features of the man before him. He saw the authority of the military governor in the whole swaggering pose of the man, and, for a moment, his firm lips tightened. Then, as though by a great effort, overcoming his reluctance for the waste of words, he displayed an almost unexpected urbanity. "It will give me very great pleasure to wait upon the Captain-General--at once," he replied. "It will be necessary, however, for me to deposit these in our vessel--in safety--before I do so." He indicated the cylinders. "You will understand when I assure you they are the most vital portions of our U-rays light. Perhaps you will favor me with your company as far as the vessel?" The officer's pose underwent a slight change. His manner became even less deferential. "My orders are--at once," he objected. Von Bersac's manner remained the same, but his dark eyes looked straight into the other's. "Quite so. Doubtless my uncle, Prince von Hertzwohl, will exonerate you for the brief delay. He is on the boat at this moment."