To continue successful football competitions and to ease the organization of games, the club had applied to join the "Rheinisch-Westfälischer Spielverband" (German: "Rhenish-Westphalian Sports Federation") on 16 February 1903, and was accepted on 23 February. Borussia continued playing local and regional opponents like Britannia Düsseldorf and BV Solingen. They also continued to travel to the nearby Netherlands, drawing Eindhoven VV 1–1. Still, the team at times struggled against mightier opponents. Borussia received a 0–11 thrashing at the hands of Borussia Cologne in October 1903 in the away fixture, before somewhat improving the performance by losing 1–4 at home in the return game. 1904, Borussia competed with several other local teams in the third class of the second district of the Rhenish-Westphalian Sports Federation. After Borussia's only competitor for the title, BV Solingen, skipped the 1905 fixture in Mönchengladbach, Borussia won the title without having to face their opponent. On 8 January 1905, Borussia additionally scored a respectable 1–0 win over its city rival FC Mönchengladbach, albeit only against the third team, confirming an earlier 6–1 win over FC Mönchengladbach on 26 December 1904. After having won the district cup, Borussia competed for the third class federation cup against, among others, teams from Essen and Cologne, ultimately losing the title to Kölner FC 99.