50 U.S.C. § 223

Forfeiture of vessels owned by citizens of insurrectionary States

From and after fifteen days after the issuing of the proclamation, as provided in section 205 of this title , any vessel belonging in whole or in part to any citizen or inhabitant of such State or part of a State whose inhabitants are so declared in a state of insurrection, found at sea, or in any port of the rest of the United States, shall be forfeited.

(R.S. § 5319.)