4"/50 Mount No. 3 from the USS Ward (APD-16) that is now a monument on the Capitol grounds in St. Paul, MN. This is the Mount that sank the Japanese midget sub attempting to enter Pearl Harbor on the morning of December 7, 1941.
USS Ward (DD-139) was a Wickes-class destroyer in the United States Navy during World War I, later APD-16 in World War II.
She fired the first American shot in World War II, when she engaged the Japanese during the attack on Pearl Harbor, and successfully sank her opponent.