...t in driving the Confederate vessels so far to-ward the city, that their fire failed to reach the besiegers. The National vessels kept up a steady fire all day, and retired at night to anchorage at Great Point Clear. In these operations of the squadron, two of the gunboats (Milwaukee and Osage) were destroyed by torpedoes. When, on the 3d of April, the Nationals had built an earth-work and mounted la...