Historical clue formulations

• W.W. II marine threat — 2013-01-06
• W.W. II craft — 2011-02-20
• W.W. II vessel — 2007-09-29
• W.W. II craft — 2005-06-05
• W.W. II torpedo craft — 2002-06-26
• W.W. II craft — 2000-05-28
• W.W. II vessel — 1998-11-18
• W.W. II vessel — 1998-10-30
• W.W. II torpedo vessel — 1998-04-30
• Torpedo vessel — 1998-03-15
• W.W. II torpedo vessel — 1998-01-02
• W.W. II menace — 1997-11-12
• Diesel-engine submarine — 1994-09-22
• Enemy vessel — 1994-08-01