The team played for seven seasons in the American National Rugby League (AMNRL) from 2000–2006.

In 2004 they relocated to nearby Ridley Park, Pennsylvania, adopting the name Delaware Valley Mantarays.

After the 2006 season the Mantarays and the Philadelphia Fight announced the two clubs would merge in order to build a more competitive team for the future.

[2] They started play in the newly organized American National Rugby League (AMNRL) the following year, replacing the Pennsylvania Raiders, another Philadelphia-based team that did not make the transition from the United States Rugby League.

After the conclusion of the 2006 season, the Mantarays and the Philadelphia Fight announced they would be merging to establish a more competitive club the following year.