Trailing since the early second quarter, Army scored the final 13 points of the game, beginning with a 36-yard field goal by Owen Tolson with 1:40 remaining in regulation time. Tulane failed to get a first down on the ensuing possession and the Cadets took over at their own 20 after a touchback on Ross Thevenot's punt.
Army's won-loss record goes to 3-3, while Tulane falls to 1-4. Army is undefeated this season at Michie Stadium.
The Green Wave was led by running back Matt Forte, who ran for 202 yards on 32 carries and scored two touchdowns in the loss. Forte also had a team-high 5 catches for 45 yards.
Quarterback Anthony Scelfo completed 16-of-25 passes for 154 yards in his second start.
Jeremy Williams grabbed 4 passes for 52 yards.
With little used senior quarterback Kevin Dunn at the throttle and :29 seconds remaining in regulation, the Black Knights marched 80 yards to paydirt to tie the score at 17. The touchdown came on a controversial 36-yard Hail Mary pass that was tipped by Tulane safety Joseph Goosby and then grabbed at the back of the end zone by a lunging Army receiver. The receiver, junior Mike Wright, was found by the ensuing review to have dragged his feet before going across the end line and the touchdown counted, sending the game into overtime.
Dunn completed 6-of-7 for 80 yards and the touchdown.
Dunn's entry into the game had come on Army's previous possession. The Knights took over the ball at the Tulane 30 after Jeremy Trimble's 18-yard return of a short Ross Thevenot punt. Army managed a first down and then Owen Tolson booted a 36-yard field goal to cut the Tulane lead to 17-10.
Tulane won the toss in overtime and elected to go on defense first. Army drove from the Tulane 25 to the 8 where Tolson booted a 25-yard field goal to give the Black Knights their first lead at 20-17.
The Green Wave failed to get a first down on their possession, forcing a 34-yard field goal attempt by Ross Thevenot that went barely wide and the Greenies had lost the game.
Tulane had broken the scoring ice early in the second quarter when Matt Forte capped an 80-yard drive with a two-yard run to make the score 7-0.
Ross Thevenot gave Tulane a 10-7 lead on a 46-yard field goal as time expired in the first half.
Midway through the third quarter Tulane went up 17-7 when Forte scored from 33 yards out. But that was the last points that the Green Wave scored.
Tulane totalled 247 yards rushing and 401 yards total offense but were penalized 11 times for 101 yards. Several of the penalties were controversial calls, including a penalty for illegal kicking called on Ross Thevenot's missed field goal attempt near the mid-point of the fourth quarter. Another penalty was assessed on a player on the Tulane bench for commenting on a spot that cost the Green Wave a first down and forced a punt as the Green Wave sought to run out the clock in the game's final minutes.
Williams, Army's starting quarterback, completed 15-of-22 for 113 yards and a touchdown before suffering an injury and being relieved by Dunn.
Mike Wright grabbed 2 passes for 63 yards for the Cadets. Senior Jeremy Trimble had 5 catches for 55 yards and the other Army touchdown. Running back Patrick Mealy had 4 catches for 9 yards. Tight end Justin Larson added 3 catches for 27 yards.
Patrick Mealy, the surprise starter at running back, netted 41 yards on 15 carries.
Tulane's defense limited the Cadets to 47 yards rushing and 240 yards total offense. The two Army quarterbacks were sacked a total of five times.
The Green Wave returns to Conference USA play when they visit Alabama-Birmingham on Saturday, October 13. Kickoff is set for 6 p.m.