The Reds found themselves behind twice inside the opening 14 minutes at Oakwell, but they showed great character to battle back and secure the points, with midfielder Henri Lansbury scoring a hat-trick.
Montanier conceded after the match that he was disappointed by his side’s slow start, but he was delighted with the way they battled back to claim the victory.
He said: “I wasn’t especially satisfied after the first 20 minutes we played, but after that it was a good reaction. We were efficient and I’m very proud as always of our squad.”
Forest have now won back-to-back Championship matches for the first time since August, and Montanier is now hoping his side can kick on during the busy festive period.
“We now have two successive victories and we needed to win because our position [in the Sky Bet Championship table] is not good,” the Frenchman added. “After [beating] Ipswich we played well, and it was important to win this game.”
A goal apiece from James Tomkins and Luka Milivojevic handed Crystal Palace a crucial 2-0 win over Huddersfield at the John Smith's Stadium on Saturday evening.
Manchester United bounced back from their Champions League exit as they beat Brighton 2-0 at Old Trafford on Saturday night to reach the FA Cup semi-finals.
Tottenham reached the FA Cup semi-finals after they cruised to a 3-0 victory over Swansea in their quarter-final clash at the Liberty Stadium on Saturday.
Premier League basement club West Brom squandered the lead as they suffered a 2-1 defeat to Bournemouth at the Vitality Stadium on Saturday.
Chesterfield boss Jack Lester felt his side were unlucky not to claim all three points after their 1-1 draw at Cheltenham.
New Swindon manager Phil Brown revelled in his side's victory at Cambridge in his first game in charge.