The Regulars had Revere remount his horse and they headed toward Lexington Green, when suddenly, they heard a gunshot! Revere told the British officer that the shot was a signal "to alarm the country!" Now the British troops were getting very nervous.
A few minutes later, they were all startled to hear the heavy crash of an entire volley of musketry from the direction of Lexington's meeting house and then the Lexington town bell began clanging rapidly! Jonathan Loring, a Lexington resident captured earlier, turned to his captors and shouted "The bell's a' ringing! The town's alarmed, and you're all dead men!"
The British officers then talked urgently among themselves and decided to release their captives so as they would not slow their retreat.
I stand corrected, there was bells involved.
And strategically, she accomplished the goal of her bus tour - to encourage Americans to learn more about their history ;-)