On this day 250 years ago from Newburyport, Massachusetts, the 1100 volunteers from the Continental Army led by Col. Benedict Arnold set sail with “colors flying, drums and fifes playing, the hills all around being covered with pretty girls weeping for their departing swains.” That night they anchored off of Wood’s Island, Massachusetts (now Maine) and the next day would sail on to the Kennebec River where they would disembark and continue their trek to Quebec.

Source: https://www.americanrevolution.org/arnolds-expedition-ascent-of-the-kennebec/

On this day 250 years ago in Philadelphia, the Continental Congress named Thomas Willing, Robert Morris, Benjamin Franklin, Silas Deane, Robert R. Livingston, John Alsop, John Dickinson, Thomas McKean, John Langdon, and Samuel Ward to the Secret Committee charged with conducting secret trade with foreign nations for military arms and supplies. 

Sources: https://www.americanhistorycentral.com/entries/september-1775/; “Editorial Note on the Secret Committee, 18 September 1775,” Founders Online, National Archives, https://founders.archives.gov/documents/Franklin/01-22-02-0127. [Original source: The Papers of Benjamin Franklin, vol. 22, March 23, 1775, through October 27, 1776, ed. William B. Willcox. New Haven and London:: Yale University Press, 1982, pp. 204–205.]

And 250 years ago

This morning the mayor of New York informed the Committee of Safety, that Governor Tryon acquainted him he had received a letter from Lord Dartmouth, informing him that orders had been given to the commanders of his majesty’s ships in America, that in case any more troops should be raised, or any fortifications erected, or any of his majesty’s stores taken, the commanders of the ships-of-war should consider such cities or places in a state of rebellion. 

according to a report in the Constitutional Gazette of New York published the following day.

Source: https://www.americanhistorycentral.com/entries/september-1775/