 In 1903 the league was divided into regional sections with Eastleigh placed in the South Division where they consolidated, however, they still maintained a strong cup pedigree.Eastleigh Athletic were regular entrants in the national competitions and in 1902–03 enjoyed their best run in the FA Cup when they reached the 4th Qualifying Round, losing 1–3 away to Whiteheads, the Dorset League champions.1908–09 was another milestone season, when the Southampton FA was formed with Eastleigh becoming founder members, and entering Reserve sides in the Associations' newly formed league.