Having thus cleverly eluded the suspicious watchfulness of the authorities, Lieutenant Worden started for home, but when near Montgomery, Ala., then the capital of the Confederacy, he was arrested, taken from the train and thrown into prison. This was on the order of General Bragg, who discovered how he had been outwitted, and the prompt reinforcement prevented the capture of Fort Pickens, for which Bragg had made every preparation. The post was held by the Unionists throughout the war and was the only one south of Mason and Dixon's line so held. Lieutenant Worden was kept a prisoner until the 13th of the following November, when, his health having broken down, he was exchanged and sent North. There he remained, slowly regaining his strength until March, 1862, when it fell to his lot to become a leading actor in one of the most famous naval engagements in all history. When war had fully begun the Union forces in charge of the Norfolk Navy Yard saw they were not strong enough to prevent its capture by the Confederates, who were arming for that purpose. They therefore set fire to the numerous and valuable shipping there. Among the vessels scuttled and sunk was the steam frigate _Merrimac_, at that time the finest vessel in the service. In truth, she went down so quickly that very little damage was done to her. The Confederates raised her, fastened a huge iron snout or prow at the front, cut down her deck and encased her with railroad iron, which sloped at an angle of forty-five degrees, and was smeared on the outside with grease and tallow. Her enormous weight made her draw more than twenty feet of water and when she was moving slowly through the bay or river her appearance suggested the mansard roof of a vast house. From what has been said it will be noted that the _Merrimac_ was a genuine ironclad, something which had never been heard of before. [Illustration: BLOCKADE RUNNER--THE "MONITOR"--CAPTAIN ERICSSON.] Regular news of the building of the _Merrimac_ (called the _Virginia_ by the Confederates) was telegraphed to Washington by friends of the Government. The authorities felt some uneasiness, but were far from suspecting the terrible power for destructiveness possessed by the monster. Captain Ericsson, the famous Swedish inventor, was constructing on Long Island an ironclad about one-fourth the size of the _Merrimac_, and he was urged to all possible speed in its completion. He kept his men busy night and day and had it finished a day or two before the completion of the _Merrimac_.