Statistics for occurrence #1 of “Commander T. A. M. Craven” in chapter 40 of Admiral David D. Porter, The Naval History of the Civil War.:

...offered a complete barrier to the enemy's fire-rafts and torpedo-vessels. The general-in-chief had now time to breathe and look about him, and observe the new condition of affairs. By June 20th Commander T. A. M. Craven , of the Navy, had sunk in the main channel at Trent's Reach four hulks filled with stone. There was also stretched across the channel a heavy boom, supporting a chain cable, well secured on each si...
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