[1][2] Created in February 1918, Once Lobos are the oldest club still active in any form of the El Salvador football league system.

[3] They played their first international match that same year, travelling about 60 km (37 mi) north to face a team in Jutiapa, Guatemala.

For many decades, the team played its home games at Estadio el Progreso, a pitch within earshot of the ancient Tazumal pyramid and its ballcourt from Pre-Columbian times.

[6] In the 1981 Season, the Chalchuapa side won the "Torneo de Copa" by beating the League Champion Atlético Marte by penalties.

At the conclusion of the regulation time, the score was tied one all (Once Lobos scorer was W. Barrera at 27‘) and nothing changed in the ensuing 30-minute overtime.

At the end of the regular season, the teams that made it onto the final Serires were Águila, Atlético Marte, Independiente and Once Lobos.

Águila fought the final in a two-round robin elimination; achieving 3rd place once again by defeating Independiente this time in the last game by a score of 2–1.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.