In the early days of the Revolutionary War, the British held a tight grip on the city of Boston. On April 19, 1775, colonial forces attempted to confront the British in Lexington and Concord. Although the British prevailed, this was the beginning of the siege of Boston.General Artemas Ward was given control over the various groups of militia by Brigadier General William Heath on April 20. Ward found it difficult to fully control the different militias but managed to position them in a siege line that ran from Roxbury to Chelsea which blocked in Boston and Charlestown.Ward’s forces were bolstered...