This is the second of two diaries kept by John Leach, a schoolmaster and civil engineer. Leach kept this diary from 29 June 1775 to 7 January 1776 and within the entries he describes his 97-day stay in a Boston prison during the Siege of Boston, prison conditions, trips to the Court of Inquiry, and the arrival and departure of prisoners. This diary also contains descriptions of the destruction of Leach’s wharf and schoolhouse by British troops in 1776.