 Complete the following phrase:  One month following the outbreak of the War, Ammen was attached to the frigate USS Roanoke and immediately embarked for the Union blockade. He was aboard, when Roanoke destroyed the Confederate schooner Mary off Lockwood Folly Inlet, North Carolina, in July 1861. Ammen was appointed commanding officer of newly commissioned gunboat USS Seneca in September that year and took part in the 