Emerging from the "Frankfurt Hot Dogs" formation, they developed a strong community which officially adopted the name "Frankfurt Löwen" (Frankfurt Lions) in 1977 and established itself as a club. A year later, the Düsseldorf Panther appeared on the scene, another milestone for American football in Germany. Before an impressive crowd of 4,000 to 6,000 spectators, the Lions defeated the Wiesbaden Flyers, leaving a lasting impression – both in the American community and in later media reports.
The official league operation started on August 4, 1978. At the DSV 04 Stadium in Düsseldorf, the "Frankfurt Löwen" met the "Düsseldorf Panther" and triumphed with 38:0 in front of approximately 4,400 spectators. A brilliant victory that was repeated in the return match with a 32:0 success. The Frankfurt team had got the hang of it and was also successful during the season. They won the first two German championships in 1979 and 1980 against the Ansbach Grizzlies, 14:8 in 1979 and 21:12 in 1980. In 1981, the Frankfurt Löwen became German Vice-Champions, losing in the final to the Grizzlies 27:6.
Sperber and Lehneis founded more and more teams, and the Frankfurt Löwen eventually became history – but what a history it was.