1775Thacher Island lighthouse was darkened for the remainder of the Revolutionary War.Events & Anniversaries, Government and Public Service, National Events, Military

The Provincial Congress in Watertown requested the coastal towns of Gloucester, Chelsea, and Plymouth darken their lighthouses as they were helping to guide enemy warships in and out of Boston.

Garland, Joseph E. Guns off Gloucester. 1st ed, Essex County Newspapers, 1975.
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