Historical clue formulations

• German port in Lower Saxony — 2018-12-02
• Port in Lower Saxony — 2016-04-02
• Saxony seaport — 2012-01-08
• North Sea port — 2006-11-24
• Saxony seaport — 2005-02-12
• German seaport protected by dikes — 2002-01-18
• Lower Saxony seaport — 1999-11-05
• Saxony seaport — 1998-08-27
• German city — 1996-01-22
• German naval base of W.W. II — 1994-03-19