The win, however, did not come easy for a wasteful Mohun Bagan who got a dramatic 53rd minute lead with Masih Saighani's own goal, while Aser Dipanda Dicka (75th) sealed the issue as the Mariners got off to a winning start under new coach Shankarlal Chakraborty.
The former champions' last win came about a month ago on December 10, a 5-0 rout of Churchill Brothers but since then their campaign hit a roadblock with three successive draws and a loss.
Having promoted to chief coach after Sanjoy Sen stepped down following their slump, Chakraborty rung in six changes including their new recruit Aussie midfielder Camron Watson and a fit-again Arijit Bagui.
Watson and Raynier Fernandes did a fine job at the centre of the pitch, while Bagui and Nikhil Kadam made inroads from Aizawl's left flank.
But a goal eluded them in the first half i9n which Aizawl FC struck the woodwork early on.
Dicka and Ansumana Kromah were at their wasteful best and missed open nets on a couple of occasions as the first goal of the match finally came in the most dramatic fashion.
In fact Mohun Bagan had their stroke of luck early in the 14th minute when Kareem Omolaja's thunderous shot from a long range curled in to hit the woodwork behind an outstretched Shilton Paul.
Mohun Bagan had their best chance in the 38th minute but Shylo Mama came in the way with a brilliant goalline save.
Goalkeeper Avilash Paul was out of position and Kinglsey tried to head it in from a Raynier corner but Mama came to Aizawl's rescue by blocking the header in front of the goal.
In the 62nd minute, there was another open miss and this time Kromah failed to head it home.
Dicka made the best use of a long ball as he dribbled past an advancing Aizawl goalkeeper Avilash Paul on the left before slotting it home with his left foot.
Moments later there was another injury blow for the hosts as the Liberian Kromah was seen limping out of the ground.
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