mcpherson said, march 8, 1862 was the worst they until pearl harbor. hundreds of united states sailors killed. all in one date by you ship that seemingly was unstoppable. ♪ >> range? ♪ mrberg: as often happens in history, these moments of serendipity and fate, the monitor arrives in a heavy fog that evening and much of the concern of the navy that was observing this tiny ship who believed she was not in the building of anything -- >> the merrimack is sweeping the union fleet. even the capital will be at the mercy of the guns of the merrimack. >> what of the monitor? >> if it ever reaches hansen roads, the merrimack will blow her out of the water. >> so that is the monitor? ♪ >> fire! [cannon fire] ♪ mr. alberg: the virginia was never able to get out of hampton roads and was eventually destroy for keep her from falling into the hands of the union. the strategy was intact and that is what made monitors a significant. it wasn't she had a superior, clear victory at the battle of canton roads. -- hampton roads. but it was able to stop the virginia for doing what she had done and that changed everything. >> so what happened? mr. alberg: december 29, 1862 monitor leads hampto