Information from this page
Ambrose made his main roster debut on November 18, 2012, at the Survivor Series pay-per-view alongside Roman Reigns and Seth Rollins; they assaulted Ryback during the triple threat main event for the WWE Championship, allowing CM Punk to pin John Cena and retain his title.
The trio declared themselves "The Shield" and vowed to rally against "injustice".
They denied working for Punk, but routinely emerged from the crowd to attack Punk's adversaries, including Ryback and the WWE Tag Team Champions Team Hell No (Kane and Daniel Bryan).
This led to a six-man Tables, Ladders, and Chairs match being set up for the TLC: Tables, Ladders and Chairs pay-per-view, where Ambrose, Reigns, and Rollins defeated Team Hell No and Ryback in their debut match.
The Shield continued to aid Punk after TLC, both on Raw and at the Royal Rumble in January 2013.
The night after the Royal Rumble, it was revealed through footage that Punk and his manager Paul Heyman had been paying The Shield and Brad Maddox to work for them all along.
The Shield then quietly ended their association with Punk while a feud with John Cena, Ryback, and Sheamus led to a six-man tag match on February 17 at Elimination Chamber, which the Shield won.
The Shield had their first match on Raw the following night, where they defeated Chris Jericho, Ryback, and Sheamus.
They continued to feud with Sheamus, who formed an alliance with Randy Orton and Big Show, and at WrestleMania 29, The Shield defeated the trio in their first WrestleMania match.
The following night on Raw, The Shield attempted to attack The Undertaker, but were stopped by Team Hell No.
This set up a six-man tag team match on the April 22 episode of Raw, where The Shield emerged victorious.
Four days later on SmackDown, Ambrose made his singles debut against The Undertaker, but lost via submission, after which The Shield attacked Undertaker and triple-powerbombed him through the announcer's table.
On the April 29 episode of Raw, The Shield defeated Team Hell No and WWE Champion John Cena in a six-man tag team match.
Later that week, Ambrose picked up his first singles victory by defeating Kane in a singles match on SmackDown.
While The Shield continued to feud with Team Hell No, Ambrose simultaneously entered a storyline feud with the United States Champion Kofi Kingston.
Ambrose pinned Kingston to earn victory in a six-man tag team match, and was attacked by Kingston several days later following a singles win over Daniel Bryan.
On the May 13 episode of Raw, The Shield's undefeated streak in televised six-man tag team matches ended in a disqualification loss in an elimination match against Cena, Kane, and Bryan, when Ambrose was disqualified as Reigns and Rollins attacked Cena.
On May 19 at Extreme Rules, Ambrose defeated Kofi Kingston to win the United States Championship, his first singles title in WWE.
Ambrose made his first televised title defense on the following episode of SmackDown, retaining his title by disqualification as the rest of The Shield interfered, and retained again against Kingston on Raw the next week.
On the June 14 episode of SmackDown, The Shield's unpinned/unsubmitted streak in televised six-man tag team matches ended at the hands of Team Hell No and Randy Orton, when Daniel Bryan submitted Rollins.
Two days later at Payback, Ambrose defeated Kane via countout to retain the United States Championship, and successfully defended the championship against Kane the following night, when he won by disqualification.
On July 14 at Money in the Bank, Ambrose competed in the World Heavyweight Championship Money in the Bank ladder match, but failed to win the match despite interference from Reigns and Rollins.
Ambrose retained his United States Championship at SummerSlam by disqualification against Rob Van Dam.
In August, The Shield began working for chief operating officer Triple H and The Authority, while Ambrose began a feud with Dolph Ziggler, against whom he successfully defended the title at the Night of Champions pay-per-view and on both SmackDown and Main Event in September and October.
On October 27 at Hell in a Cell, Ambrose lost to Big E Langston by countout, but retained his title.
Tension began brewing among The Shield in October, especially between Ambrose and Reigns as Ambrose was the only member left with a championship.
At Survivor Series, The Shield participated in a traditional Survivor Series match; Ambrose was the first man eliminated while Reigns won the match as the sole survivor.
At TLC: Tables, Ladders and Chairs, CM Punk defeated The Shield in a handicap match after Ambrose received a Reigns spear aimed for Punk.
At the Royal Rumble, The Shield participated in the Rumble match; Ambrose eliminated three wrestlers and tried to eliminate Reigns, who retaliated by eliminating both Ambrose and Rollins.
In February 2014, Ambrose retained the championship against Mark Henry with a disqualification loss; a rematch in March yielded a pinfall victory for Ambrose.
Also in February, The Shield lost to The Wyatt Family at Elimination Chamber with Ambrose absent during the finish of the match.
Despite more tension, The Shield reconciled in March.
Later in March, The Shield began a feud with Kane, turning them into fan favorite characters, and resulting in The Shield defeating Kane and The New Age Outlaws at WrestleMania XXX.
The Shield next turned on Triple H, who reformed Evolution with Batista and Randy Orton to take on The Shield.
On April 28, Ambrose surpassed Montel Vontavious Porter as the longest reigning United States Champion under the WWE banner.
On the May 2 episode of SmackDown, Ambrose retained his title in a four-way match against Alberto Del Rio, Curtis Axel, and Ryback.
As part of their feud with Evolution, The Shield won a six-man tag team match at Extreme Rules.
The following night on Raw, Triple H forced Ambrose to defend his championship in a 20-man battle royal with Rollins and Reigns not part of the match; Ambrose survived until the final two but lost to Sheamus, ending Ambrose's record title reign at 351 days.
On the next SmackDown, Ambrose failed to regain the championship in a singles match against Sheamus.
The Shield once again defeated Evolution at Payback, prompting Triple H to initiate "Plan B".
This involved Rollins turning on Ambrose and Reigns, subsequently aligning himself with Triple H.
