The Wolves midfielder was always going to be the second man to arrive at a loose ball which Gomez had taken in his stride when poleaxed by Henry's challenge.
With Wolves forced into a purely defensive mindset, Wigan predictably began to enjoy a significant quantity of possession and passed the ball around confidently.
But for the remainder of the first half they barely created a single genuine opportunity, as the lone Wolves striker Kevin Doyle was frequently called back to assist with the two banks of four already set up to defend.
After brief treatment Gomez was able to resume, but much of the cut-and-thrust provided by Wigan was from Charles N'Zogbia, appearing on either flank.
Martinez proud of Wigan players
Di Santo was unable to get on the end of N'Zogbia's cross along the six-yard line, and the Latics were largely restricted to long-range shots, with Rodallega among those to test Marcus Hahnemann.
The game was not entirely played in front of the Wolves goal. A rare attack from the visitors earned a corner on the left, and Matt Jarvis's delivery resulted in a scramble in the box that was only ended when Steven Fletcher picked up a yellow card for catching Franco Di Santo.
The only other opportunity for the visitors had come when Fletcher had hit a free-kick off-target.
Di Santo then saw an effort deflected behind at the other end as half-time approached and a cross from N'Zogbia was headed just past the post by Gomez as the frustration grew for the home fans.
Wigan played with more poise in the second half. A delightful move started by Gomez forced a good save by Hahnemann to deny Di Santo, though the Argentine, who was involved in a brilliant dummy earlier in the build-up, must have been disappointed not to produce a finish with more sting in it.
Henry red card was deserved - McCarthy
Finally deliverance came when David Edwards was adjudged to have fouled N'Zogbia on the very edge of the box. Gomez clipped the free-kick over the wall and there was nothing Hahnemann could do to reach it as it bounced into the goalmouth via the bar.
Hahnemann was called on to make more saves as Wigan pushed forward looking for a second. And they got it when N'Zogbia played in Rodallega with a perfectly-weighted pass. Berra reacted quickly, only to find the ball sliding off the Wigan player's feet and into the Wolves goal.
65:46 Matthew Jarvis fouled by Steve Gohouri, the ref awards a free kick. Matthew Jarvis has an effort direct from the free kick.
64:39 GOAL - Jordi Gomez:Wigan 1 - 0 Wolverhampton Jordi Gomez grabs a goal direct from the free kick from just outside the box to the top left corner of the goal. Wigan 1-0
63:40 Free kick awarded for a foul by Stephen Ward on Charles N'Zogbia.
62:38 Hugo Rodallega takes a shot. Save by Marcus Hahnemann.
61:50 The ball is delivered by Ronnie Stam, save by Marcus Hahnemann.
61:20 Charles N'Zogbia sends in a cross, James McCarthy takes a shot. Clearance made by Jody Craddock.
58:59 Indirect free kick taken by Marcus Hahnemann.
58:59 Substitution Ronnie Stam joins the action as a substitute, replacing Maynor Figueroa.
58:59 Franco Di Santo is caught offside.
57:02 Charles N'Zogbia takes a shot. Blocked by Jody Craddock.
55:39 Kevin Doyle gives away a free kick for an unfair challenge on James McCarthy. Emmerson Boyce takes the direct free kick.
53:21 Unfair challenge on Emmerson Boyce by Kevin Doyle results in a free kick. Emmerson Boyce restarts play with the free kick.
52:48 Jordi Gomez takes a shot. Save made by Marcus Hahnemann.
52:08 The official flags Kevin Doyle offside. Free kick taken by Ali Al Habsi.
51:12 Substitution (Wolverhampton) makes a substitution, with George Elokobi coming on for Steven Fletcher.
50:00 James McCarthy has a volleyed shot. Marcus Hahnemann makes a save.
49:53 The ball is crossed by Maynor Figueroa, clearance made by Christophe Berra.
48:30 Centre by Emmerson Boyce, Christophe Berra gets a block in.
45:51 Franco Di Santo takes a shot. Save made by Marcus Hahnemann. Franco Di Santo takes a shot. Save by Marcus Hahnemann.
45:01 The referee gets the second half started.
45:00+0:56 The whistle is blown to end the first half.
44:52 Kevin Foley takes the direct free kick.
44:52 Booking The referee shows Hendry Thomas a yellow card for unsporting behaviour.
44:48 Foul by Hendry Thomas on David Edwards, free kick awarded.
42:43 Franco Di Santo takes a shot. Jody Craddock gets a block in. Charles N'Zogbia takes a inswinging corner from the right by-line
played to the near post, David Edwards manages to make a clearance. Charles N'Zogbia crosses the ball.
41:16 Hugo Rodallega is caught offside. Marcus Hahnemann takes the free kick.
40:20 Direct free kick taken by Ali Al Habsi.
40:20 Booking Steven Fletcher receives a yellow card for unsporting behaviour.
40:05 Steven Fletcher gives away a free kick for an unfair challenge on Franco Di Santo.
39:49 Matthew Jarvis takes a inswinging corner from the left by-line played to the near post.
38:18 Hugo Rodallega delivers the ball, Jody Craddock manages to make a clearance.
37:42 Foul by Franco Di Santo on Kevin Doyle, free kick awarded. Free kick taken by Kevin Foley.
37:04 The ball is sent over by Maynor Figueroa.
35:48 Shot by Hugo Rodallega from outside the box goes high over the crossbar.
33:22 Hendry Thomas takes a shot. Blocked by David Edwards. Inswinging corner taken right-footed by Hugo Rodallega from the left
by-line, save by Marcus Hahnemann.
33:16 A cross is delivered by Franco Di Santo, clearance made by David Edwards.
29:58 Kevin Doyle fouled by Antolin Alcaraz, the ref awards a free kick. The free kick is delivered right-footed by Matthew Jarvis
from right wing.
28:40 Charles N'Zogbia takes a shot.
27:40 Unfair challenge on Kevin Doyle by Hendry Thomas results in a free kick. Stephen Ward takes the direct free kick.
27:06 Kevin Foley sends in a cross, save by Ali Al Habsi.
26:07 Inswinging corner taken right-footed by Matthew Jarvis played to the near post, clearance made by James McCarthy.
25:29 The ball is sent over by Kevin Foley, Emmerson Boyce manages to make a clearance. Corner taken by Matthew Jarvis from the
left by-line played to the near post, Steve Gohouri manages to make a clearance.
20:31 Michael Mancienne fouled by James McCarthy, the ref awards a free kick. Free kick taken by Kevin Foley.
18:32 Steve Gohouri concedes a free kick for a foul on Kevin Doyle. Strike comes in from Steven Fletcher from the free kick.
17:30 The official flags Charles N'Zogbia offside. Free kick taken by Marcus Hahnemann.
15:29 Charles N'Zogbia takes a shot. Michael Mancienne gets a block in. Jordi Gomez has a shot and went wide right of the net.
14:37 Shot from just outside the area by Maynor Figueroa goes over the bar.
13:35 Kevin Doyle gives away a free kick for an unfair challenge on Maynor Figueroa. Ali Al Habsi takes the free kick.
10:22 Hendry Thomas takes the free kick.
10:22 Sent off The referee red cards Karl Henry for serious foul play.
10:15 Karl Henry gives away a free kick for an unfair challenge on Jordi Gomez.
9:28 Charles N'Zogbia challenges Stephen Ward unfairly and gives away a free kick. Karl Henry restarts play with the free kick.
5:32 Free kick awarded for an unfair challenge on James McCarthy by Karl Henry. Direct free kick taken by Emmerson Boyce.
4:47 Unfair challenge on James McCarthy by Kevin Doyle results in a free kick. Free kick taken by Ali Al Habsi.
1:22 The ball is crossed by Stephen Ward, Unfair challenge on Antolin Alcaraz by Matthew Jarvis results in a free kick. Ali Al
Habsi takes the direct free kick.
0:13 Steven Fletcher challenges Jordi Gomez unfairly and gives away a free kick. Antolin Alcaraz takes the direct free kick.
0:00 The match gets underway.
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