MAC rivals

Delaware and Lehigh, both football independents and members of the Middle Atlantic Conference in other sports, began playing an annual gridiron matchup in 1950. Initially, the Engineers (as Lehigh's teams were then known) were the established powerhouse and the Blue Hens were the upstart looking to prove themselves, a status reflected in Lehigh's 1950 shutout win. The rest of the 1950s was harder fought, reflecting Delaware's growth as a football program, and leading to a nine-year rivalry win streak in the 1960s.^[6]

The Blue Hens–Engineers rivalry became a league game in 1958, when the MAC formally organized two football conferences, one of them a "University Division" including Delaware and Lehigh. The MAC University Division continued playing until 1969. During the last nine years of league play, Delaware won every game against Lehigh, the longest win streak between the two teams.

Those losses led to Lehigh adopting the Delaware Wing-T, which had troubled its defenses so much, as its own offensive scheme.^[7]

D-II independents

As Division II independents in the 1970s, Delaware and Lehigh continued to meet annually in the regular season, in a matchup that almost always had playoff implications: Delaware took part in the Division II tournament in 1973, 1974, 1975, 1978 and 1979, winning the championship in 1979, while Lehigh earned Division II playoff berths in 1973 and 1975.

It was during this era that the rivalry really heated up, recalled The Morning Call sports columnist Terry Larimer in 2000. The late 1970s and early 1980s saw a series of hard-fought games with one-score margins.^[8]

Both teams later moved up to the NCAA Division I Football Championship Subdivision, originally known as Division I-AA: Lehigh in 1978 and Delaware in 1980. During this era, the matchup continued on their independent schedules, again pitting national powerhouse teams against each other, as Lehigh qualified for the postseason in 1979 and 1980, and Delaware participated in the Division I-AA playoffs in 1981 and 1982.

In 15 seasons from 1968 to 1982, the Lambert Cup, recognizing the top small-college football program in the Northeast, was awarded to either Delaware or Lehigh every year except two. Delaware won the cup 10 times, and Lehigh won it four times, including a Delaware-Lehigh tie in 1973.

For Lehigh players, the Delaware game was the one that mattered most, recalled late 1970s Engineers linebacker John Shigo. Not only was Delaware one of the toughest opponents on the schedule, but because the schools recruited in the same territory, many Lehigh players had been turned down by Delaware as too slow or too small – giving them extra motivation to beat the Blue Hens.^[8]

Mike Schoenwolf, a quarterback and punter for the late 1970s Blue Hens, said his teams had a similar motivation: "The big thing at that time was, you don't lose to anybody in your backyard," he said. "And Lehigh was in our backyard. Back in those years, it was a game we had to win. There was no question about it."^[1]

Different leagues

Regular-season matchups became rarer after 1986, when Delaware joined the Yankee Conference (later renamed Atlantic-10 and currently Colonial Athletic Association), and Lehigh joined the unrelated Colonial League (now called Patriot League).

Delaware, playing in a league with other state universities, continued to compete at a high level in Division I-AA, making the playoffs several times in the late 1980s and the 1990s. Lehigh's new conference, on the other hand, barred its members from offering athletic scholarships or participating in the postseason. As the Colonial League had modeled its bylaws on the Ivy League, Lehigh's non-conference schedule largely consisted of Ivy teams. Their last matchup of the 1980s was played in 1987.

After a five-year hiatus, the longest break in the series since 1950, Delaware and Lehigh played five games in the 1990s. As of 2020, the former league rivals have met during the regular season only once in the 21st century, a Delaware win in 2005. They have met twice in the FCS national playoffs, however, both Delaware wins.