Dartford booked their place in the third round of the FA Trophy with a 1-0 win over Ashford Town (Middlesex).
An inspired substitute by manager Tony Burman helped bring about the only goal at the Robert Parker Stadium.
Ryan Hayes was brought on for Adam Burchell and immediately found Billy Burgess, whose low cross was turned in by George Purcell - the ex-York City striker who joined the club on loan at the end of last year.
Saturday's game saw two new faces introduced to the squad, including Jon Main, who joined from AFC Wimbledon on a one-month loan deal on Friday, having scored 61 goals since joining The Dons three years ago. The 26-year-old striker has also played for Cray Wanderers and Tonbridge Angels during a promising career.
Another loan signing, Jack Clark, was also included in the starting 11. The teenage defender has featured regularly in Charlton's under-18s and reserve team since signing for the club in 2009.