Historical clue formulations

• Enemy vessels in W.W. II — 2025-07-02
• W.W. II naval menaces — 2024-12-23
• Some subs — 2022-01-28
• Vessels hunted by K-ships — 2022-01-02
• They hid beneath the surface — 2018-08-29
• Battle of the Atlantic craft — 2017-10-22
• W.W. II shipping worries — 2017-10-01
• W.W. II threats — 2014-04-09
• Old minelayers — 2012-12-02
• W.W. II threats — 2010-02-21
• Threats to World War shipping — 2007-09-06
• W.W. II wolf pack — 2006-09-24
• World War marine menaces — 2006-05-10
• Depth charge targets — 2000-12-12
• German subs — 1999-10-26
• Maritime hazard in W. W. II — 1998-11-24
• W.W. II wolf pack — 1995-07-23
• W.W. II craft — 1994-08-25