Republic of Ireland striker Adam Idah struck a late winner as Norwich began life back in the Championship with a 1-0 victory at Huddersfield.
Idah tucked home nine minutes from time at the John Smith’s Stadium after Teemu Pukki pounced on a poor back-pass by Richard Stearman.
The result meant defeat for Carlos Corberan in his first league match as Terriers boss.
Fellow relegated side Bournemouth enjoyed a dramatic 3-2 win over Blackburn in new manager Jason Tindall’s first match in charge.
Arnaut Danjuma finally killed off a battling Rovers team six minutes from time with a superb strike at the Vitality Stadium.
Armstrong thought he had given the visitors a late lead but it was ruled out for offside and the Cherries, back in the second tier after five years in the Premier League, grabbed the points late on through Danjuma.
Aitor Karanka celebrated a 1-0 win over Brentford in his league bow as Birmingham manager at St Andrew’s. Jeremie Bela headed the only goal eight minutes before the interval as the Bees, who hit the post through Josh Dasilva, suffered a hangover from last season’s promotion near miss.
Veljko Paunovic, now free of quarantine requirements, also enjoyed his first match as Reading boss as they won 2-0 at Derby.
The goals came in the latter stages of the first half. Lucas Joao claimed the first before turning provider, with a clever back-heel, for Ovie Ejaria to score on his first appearance since making his loan from Liverpool permanent.
Sheffield Wednesday made a bright start to what could a difficult season after their 12-point deduction with a 2-0 win at Cardiff.
Bristol City scored the quickest goal of the day but it took an 82nd-minute winner from Tomas Kalas to secure a 2-1 home win over promoted Coventry.
There was late drama in the clash of the other two promoted sides at Adams Park.
Michael Ihiekwe headed a stoppage-time winner as Rotherham snatched victory over Wycombe, who were playing the first match in their history at this level.
Wolves loanee Morgan Gibbs-White made an immediate impact on his Swansea league debut with the only goal in a 1-0 win at Preston. Meanwhile QPR saw off Nottingham 2-0 after a Lyndon Dykes penalty and last-minute Ilias Chair effort.
James Collins followed up last week’s hat-trick in the Carabao Cup with a fine late strike to give Luton a 1-0 win at Barnsley while Millwall and Stoke played out a goalless draw.