Martin O'Neill was left to reflect on a late comeback after Ryan Noble's last-gasp goal sealed victory over FC Groningen.
Sunderland rounded off their Peace Cup campaign with a 3-2 win, sealing third place in the competition in the process.
Groningen hit back with a double blast after Connor Wickham had given Sunderland the lead, following in after Titus Bramble's shot was saved.
But the Black Cats turned it around in fine fashion late on, with Fraizer Campbell converting Craig Gardner's cross before Noble turned on the style with a superb solo goal to win it.
And the goal rounded off a productive trip for O'Neill, who said: "Ryan was very positive and scored a fantastic goal, which he deserved.
"He made a big impact in the 15 minutes he was on - he tried to get hold the ball and didn't give it away.
"Ryan played a superb little ball through for the second goal and then his was absolutely brilliant. I'm delighted with that.
"All in all, it's been a good trip for us. I have started to learn something about some of the younger players and even a wee bit more about the senior ones too.
"Overall, in terms of fitness and education it's been excellent."
O'Neill was forced to make changes for the game with Ben Wilson and Jordan Pickford sharing the goalkeeping load after Simon Mignolet was rested due to slight knock.
Meanwhile Carlos Cuellar and Wes Brown both limped off and will be assessed.
"Simon had a groin problem today and we decided not to risk him in the game," O'Neill said.
"Wes has done some damage and that's a concern, while Carlos complained of his thigh being sore.
"It was nice for [Wilson and Pickford] to get a game with Simon not being risked. I thought they aquitted themselves pretty well."
The Sunderland manager added: "It was a great end to the game, I must admit. I thought we looked a little fitter than we did in the first game and it was nice to finish in a blaze of glory at the end.
"The fans have travelled a long way to watch us and it was nice for them to have something to cheer."