As we all know, two lanterns were hung on April 18, 1775, warning Revere and his compatriots that the British were using the quicker seaside route, and thus Lexington prepared for battle long before the Redcoats attacked.

https://www.bostonmagazine.com/news/2017/07/04/who-hung-lanterns-old-north-church/

As we all know, two lanterns were hung on April 18, 1775, warning Revere and his compatriots that the British were using the quicker seaside route, and thus Lexington prepared for battle long before the Redcoats attacked.

https://twitter.com/BRInstitute/status/1251513571911098375

April 18, 1775 - General Gage orders 700 British soldiers to Concord to destroy the colonists' weapons depot.

That night, Paul Revere and William Dawes are sent from Boston to warn colonists. Revere reaches Lexington about midnight and warns Sam Adams and John Hancock who are hiding out there.

https://www.historyplace.com/unitedstates/revolution/revwar-75.htm