In UL's first ever game, they took the field on the road to the eventual Shamrock Bowl champion Dublin Rebels and were beaten 48-0. The Vikings lost their first four games, but on December 2nd, 2001, they recorded their first ever win, 12-8 over the Dublin Dragons in Limerick, with touchdowns from Tommy Conneelly and Paddy "The Saint" Ryan.
In 2002 the Vikings won every game they played thanks to a powerful team of mostly American exchange students. As league champions, they progressed directly to the Shamrock Bowl. However, as most of the American students had returned home, UL was well beaten by the Carrickfergus Knights.
The Vikings decided that for the long term benefit of the team, they couldn't rely on exchange students as much as they had been doing. In 2003, the Vikings joined Division 2 of the IAFL to help develop their young Irish players. Despite going 0-3, the foundations were laid for future success, with a freshman class that included Liam Ryan, Kieran Coen, Liam Hayes and Christopher Moloney.
In 2004, the Vikings were back in the expanded IAFL. Once again, they found it tough, going 0-8 against league opposition. The one silver lining from 2004 was a great recruiting class that included 4 starting caliber Offensive Linemen, Jamie O' Brien, Kieran Stack, Sean Walsh and David Wallek. It was an extremely difficult season but one that developed the current core of the team. After surviving through a winless season the sense of team unity has been in place since then.
In 2005, the much improved Vikings narrowly missed the playoffs, finishing 3-5. After tough opening games against the Dublin Rebels and the Belfast Bulls - both Shamrock Bowl finalists that year, the Vikings recorded their first win since 2002 with a 26-22 victory over the Cork Admirals. The organisation of the club also developed this year with a management structure put in place and a lot of work done, by Damien Laffan in particular, to promote and develop the club in the Limerick area. In this year the structures were put in place that would lead to the successes of the following two years.
Buoyed by their promising 2005 campaign, the Vikings made the playoffs their goal in 2006. With the team becoming more and more popular around Limerick, the Vikings had another strong recruiting class and the team was made up of mostly Irish players, although they were helped by the arrival of four American exchange students - Chris Bassitt, Jeremiah Sexton, Alex Smith and Seamus Hogan. The 2006 UL Vikings finished the season with a 5-2-1 record, led by their defense, which gave up only 6 points in 5 home games (scored by Dublin City Marshals QB Seth Larson).
The Vikings made the postseason for the first time in 4 years. Aided by the return of former players Kieran Coen and Dan Levy, UL defeated the Carrickfergus Knights on the road to make the Shamrock Bowl for the second time in the team’s short history. However, a very strong Dublin Rebels team upended the Vikings 44-12 to claim their 4th consecutive Shamrock Bowl victory.
The Vikings had their greatest season ever in 2007. Winning every game they played (the sole loss coming by way of a forfeit due to field unavailability against Cork) in dominant fashion - their smallest margin of victory being 16 points. The Vikings league best defence allowed more than 6 points in a game only once, in a 36-20 road victory over the Cork Admirals, and the offense was equally as dominant, averaging almost 43 points a game and scoring at least four touchdowns in every game, led by an overpowering O-Line and strong running game.
The Vikings entered the playoffs as Shamrock Bowl favourites, but had to get past a 4th-seeded Belfast Bulls team in the semi-finals, eventually winning by a dominating 44-2 scoreline. This led to the first ever all Munster Shamrock Bowl against the Cork Admirals, which was held in the UL Sports Ground. The Vikings won a close fought match by a margin of 22-14 courtesy of three rushing touchdowns from game MVP Seamus Hogan to claim their first ever Shamrock Bowl title.
The Vikings finished the 2008 regular season with a 7-1 record, winning their second consecutive Southern Division title. The sole loss came at home at the hands of fellow Shamrock Bowl finalists Dublin Rebels. The Vikings returned most of the starters from the 2007 season, including MVP Seamus Hogan, and added former Chicago Slaughter offensive lineman Jim Davis to their roster. After a slow start offensively in their first two games, the Vikings decided to move Seamus Hogan back to running back and appointed JP Nerbun as their starting QB. Nerbun went on to lead the league in passing efficiency, throwing 15 touchdowns and no interceptions in four games as starter, while Hogan recorded at least one touchdown in every game of the season, except for the defeat against the Dublin Rebels, where he left the game injured after the first series. The Vikings finished as the number two seeds, and after easily defeating the Belfast Trojans 42-8 in the semi-final, proceeded to their third consecutive Shamrock Bowl. The bowl took place on August 10th at CIT Stadium against the number one seeded Dublin Rebels. A rushing touchdown from MVP Adrian Garvey, and an interception return for a touchdown from Darragh 'Plum' O'Callaghan gave the Vikings a 14-3 lead going into half-time, and thanks to a blocked field goal in the fourth quarter, the Vikings won their second Shamrock Bowl in two years, defeating the Rebels 14-12.
The 2009 season saw the Vikings return the core of their team from 2008, but lost linemen Jim Davis and Kieran Coen to the Valencia Firebats of the Spanish League.
The Vikings once again relied upon power running and a tough, fast defense to make the playoffs for the fourth year in a row, but they once again fell to the Dublin Rebels, this time 12-7 at home. The Vikings finished as the number two seed for the third year in a row, and met the physical Carrickfergus Knights at home in the semi finals, where they welcomed back Davis and Coen, who had helped lead Valencia to victory in the Spanish Bowl. Leading 20-0 at half time, the game was abandoned shortly after the break when a Knights player was seriously injured, and the Vikings advanced to their fourth Shamrock Bowl in a row.
The Vikings met the Dublin Rebels in Belfast for Shamrock Bowl XXIII. In a close, physical game, the score was tied at 6-6 after four quarters, which meant the Shamrock Bowl would go into overtime for the first time in the game’s history. The Rebels won the toss and elected to receive the ball, but two plays into the extra period, Rebels' QB Andy Dennehy was intercepted by Vikings' CB JP Nerbun to set up a game winning 30 yard field goal attempt. UL kicker Danny Smith converted it successfully and the Vikings claimed their third Shamrock Bowl in three years.
The Vikings continued the success of recent years by reaching the playoffs for the fifth successive year. The team was once again led by a strong running game and a physical defense on their way to a division-topping 6-1-1 record. Their only defeat once again came at the hands of perennial championship rivals, the Dublin Rebels.
In June 2010, the Vikings won their first international title, by winning the second EFAF Atlantic Cup, held in Dublin. This win, along with their consistent domestic success, elevated the Vikings into the EFAF Top 20 rankings for the first time in the team's history, debuting at No. 19 and finishing out the season in 18th.
The Vikings success in the Atlantic Cup resulted in them being named the IFAF Team of the Month for June 2010 - the first Irish team ever to win this award.
The team then proceeded to their fifth Shamrock Bowl in five years by beating the Carrickfergus Knights 20-0 in their Shamrock Bowl semi-final, however the team failed in their bid to make it four Shamrock Bowl victories in a row as they lost in the Shamrock Bowl to the No. 1 seed Dublin Rebels, 15-0.