Historical clue formulations

• French siege site of 1597 — 2016-06-11
• City on the Somme — 2012-09-16
• Somme place — 2011-10-23
• French treaty city of 1802 — 2007-12-30
• Cathedral of Notre Dame locale — 1999-04-18
• Somme place — 1997-09-20
• Somme's capital — 1994-11-01