Possible Clues:

• Read closely, there's a string attached to the agreement
• Study what is needed for binding agreement
• Agreement on tailless aircraft
• Agreement for a tail-less aircraft
• Amity
• Before taking one of the strings, study harmony
• Agree lag should get the rope
• Study what could be binding agreement
• *"Shot heard 'round the world" site
• Harmony in town where fight for independence began