By an Express that passed through this city in his way to the Continental Congress this afternoon, we are authorised to inform ー the Public, that Fort Chamblee is in the possession of the American forces, who have taken 50 barrels of powder, and 150 of the Regulars prisoners, with the Colours of the seventh regiment, which are sent to the Congress, and have been seen by several gentlemen here; it was expected that St, John's would be in our hands before the Express reached Ticonderoga.