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The gun that fired the first shots of the Pacific War (WW2)

The 4"/50 (10.2 cm) No. 3 gun from the USS Ward DD-139, which fired the first American shots of the Pacific War, sinking one of the five Japanese Ko-hyoteki class midget submarines that were attempting to enter Pearl Harbor on December 7th 1941.

It is located in the State Capitol grounds in St. Paul, Minnesota.