Possible Clues:

• Misery at the front in an unspecified battle
• Few protecting thousand in war zone
• A few capture the start of military battle
• River through Amiens
• First World War battle location
• Thus madame is seen in one of her rivers?
• 1000 trapped in a remarkable battle
• A little over one million casualties were suffered here
• Scene of conflict -- considerable mire, with fury expressed at its heart
• Few crossing motorway in old battle zone