February began with a goalless draw at home to Rotherham United, before a single-goal defeat in Swansea.
Goals were few and far between as the month rolled on, with a goalless draw with Sheffield Wednesday acting as a third game without registering, however, two 1-0 wins on the road following that were to prove vital.
Firstly, Murray Wallace became the Emirates FA Cup hero once more with the winner at AFC Wimbledon, before it was the turn of Jed Wallace in a midweek trip to Derby County, with the winger's strike gaining a much-needed three points over the Play-Off contenders.
Consecutive home and away defeats to the duos of Preston North End and Norwich City and Hull City and Bolton Wanderers respectively saw The Lions hover just above the bottom three, but Ben Thompson's double got Millwall back to winning ways at Birmingham City - in a game that saw David Martin take his place between the sticks and loanee Alex Pearce captain the side.
Pearce and Aiden O'Brien sent The Den into ecstasy with their goals in an Emirates FA Cup Quarter-Final tie against Brighton & Hove Albion, but Millwall were to miss out on a Wembley showdown with Manchester City in heartbreaking circumstances, losing on penalty kicks to The Seagulls.
Full focus was now back on securing Sky Bet Championship survival, however, and after a 3-2 loss at Leeds United saw a much-improved performance, four points from two home games against West Bromwich Albion and Queens Park Rangers preceded Jake Cooper's 95th-minute equaliser against Sheffield United at Bramall Lane, sparking wild celebrations amongst the travelling supporters.
A 1-1 draw with Brentford and a 1-0 loss at Play-Off Finalists Aston Villa completed the Easter period, before a goalless draw at home to Stoke City, coupled with Rotherham United's defeat at West Bromwich Albion, confirmed that The Lions would play Championship football in 2019/20.
A 2-1 defeat at home to Bristol City and a slender last-day loss at Wigan Athletic ended the campaign, but attentions have now already turned to the new season - The Lions' third straight in the second tier.