Eintracht Frankfurt was officially founded on March 8, 1899, as Frankfurter Fußball-Club Victoria von 1899. The initial idea behind forming the team was to create a football club that could represent the city of Frankfurt and compete against other teams in the region. It wasn't until May 24, 1911, when they achieved their breakthrough by merging with another local club called Kickers in order to form TuS Eintracht Frankfurt/Kickers (source: einrichtfrankfurt.de).
The early years for Eintracht were marked by struggles both on and off the pitch as they tried to find sustained success. However, it didn't take them too long to make an impact after their formation when they won regional titles around World War I (source). Some notable players from this era include Otto Warmbrunner, Wilhelm Bender, and Richard Kress.
Despite these early achievements, Eintracht still had plenty of room for improvement. They experienced fluctuating fortunes during most of their pre-WWII history - sometimes enjoying successful seasons while finding themselves relegated at other times.