The Black and Whites were heartbroken last Saturday as they went down 16-0 at Wembley at the hands of Wigan in the Challenge Cup Final, but they showed plenty of resolve to turn the tables in their Super League rematch.
Hull trailed 26-12 at one stage but they hit back to snatch victory from the jaws of defeat with two very late drop goals from Daniel Holdsworth to seal a memorable victory.
Gentle said: "It was interesting, wasn't it?
"I thought we had thrown it away. There was a time there when we couldn't get our hands on the ball and then all of a sudden we had all the ball.
"It has been a tough week, it has been tough to try and generate some intensity in training. To get a victory is all we needed tonight and we didn't care how we did it.
"It sets us up now to get a win next week and hopefully a home semi."
Wigan coach Shaun Wane took pride in the way his young side battled and thought a draw would have been a fair result.
Wane made a number of changes from the team that won the Challenge Cup last weekend, with several players rested and others injured.
He said: "I thought everyone's attitude was spot-on. We could have won it but I think a draw would have been a fair result.
"They are a good team, Hull, and they were missing a few from the weekend. I think a draw would have been fair and if we had sneaked it I don't think anyone would have complained.
"I'm unhappy because we have lost again but I will wake up in the morning and I'll be pleased. I need to give credit to John Winder and Matty Peet, our junior staff who have brought the lads through. "
The Warriors are assured of a top-four finish but Wane does not like losing and he was less impressed with some news he heard down on the touchline.
The time clock reportedly stopped with five minutes remaining and was not restarted for 60 seconds while the game continued, and Wane vowed to check the timings when watching the game back on video.
Wane added: "Our clock was two minutes over at the end of the game. I will time it again tomorrow.
"On the sideline we were dismissed so they must be right - but I will be checking it, you can guarantee that."