What successful northern naval victory stongly proved the value of sea power?

Answer 1

successful northern naval victory = when? where?

Answer 2

http://www.infoplease.com/ce6/history/A0857368.html

Answer 3

I vote for the battle for New Orleans because it was early in the war and established the ability of the north to cut off an important economic and social asset to the Confederacy by sea power alone.