Swindon beat Southend 6-1 last season in the LDV, but went behind tonight before Swindon came back to win 3-2 and book their place in round 2.
Swindon's goals were scored by Sam Parkin on 34 and 48 mins, and Tommy Mooney on 73 minutes.
Swindon's starting team was: Evans, Smith, Hewlett, Viveash, Igoe, Parkin, Stevenson, Howard, Heywood, Reeves, and Robinson