Historical clue formulations

• ___-Argonne offensive of W.W. I — 2005-11-03
• North Sea tributary — 2004-08-15
• North Sea tributary — 2004-06-19
• North Sea feeder — 2001-08-26
• Scene of W.W. I fighting — 2000-09-07
• Verdun's river — 1998-10-18
• River at Liège — 1997-10-19
• Verdun's river — 1994-08-17
• Verdun's river — 1994-03-09