The roar that greeted the last-minute penalty save from Ryan Boot that ensured a 2-1 win was just as loud as the reaction to the two lovely first-half goals from Liam Mandeville and Lee Bonis which gave the Spireites a foothold in the match.
The three points also gave Paul Cook’s side a four-point lead in seventh spot over the Mariners, in eighth.
It has also got the supporters fancying a play-off spot, and maybe even a trip to Wembley.
Scroll through our fans’ picture gallery and see if you can spot yourself or someone you know in the crowd.
9. Chesterfield 2 Grimsby Town 1
Fans fill the stands at the SMH Group Stadium Photo: Brian Eyre
10. Chesterfield 2 Grimsby Town 1
Goal ... supporters celebrate Chesterfield scoring Photo: Brian Eyre
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