By the eve of the American Revolution, Putnam had become a relatively prosperous farmer and tavern keeper, with more than a local reputation for his previous exploits. On April 20, 1775, while plowing one of his fields with his son, he received news of the Battle of Lexington and Concord that started the war the day before. He literally "came off the plow", leaving it in the field and riding in eight hours, reaching Cambridge the next day and offering his services to the Patriot cause. Putnam was named a major general, making him second in rank to General Artemas Ward in the Army of Observation, which preceded the founding of the Continental Army.