...nto shoal water, where we could not reach her, the Merrimac's draft being over 20 feet and her's only about 10. As there was nothing more to fight, the tide being favorable the Merrimac returned to Norfolk , where she was docked. She was then thoroughly overhauled and equipped for fighting an iron-clad. A prow of steel and wrought-iron was put on. Bolts of wrought-iron and chilled iron were supplied...