Possible Clues:

• A fog that's freezing brings fighting to an end
• A fog covering river, and the effect of freezing means a ceasefire
• When warring armies may embrace cessation of conflict and beginnings of international co-operation?
• Truce after weapon destroyed cities
• Fire is prevented by this spray penetrating most of dry cable's sheath
• End of hostilities
• Truce reached by warring cities after navy reduced by half
• Most of crisis team engineered truce
• Peace for the time being — it's a crime, if one breaks it
• Organises armies around troop leader in charge of one of those putting an end to fighting