He is apparently now hoping that this taste of success will continue when he captain's the England U21 team in the European Championships in Switzerland.
"That's the first thing I've won (Worthington Cup), so it would be lovely to go out in my last year with the Under-21s by winning this," said Dunn.
"We all know there's a lot of hard work to be done, but we're confident that we've got what it takes.
"The last two friendlies we've played against Portugal and Italy, we haven't been at our best, we all know that," he continued...
"But if we do play our best and we show the form that we did against Greece and that we did against Germany, then we firmly believe that we can go on and win it, and that's what we'll be trying to do."
As for the speculation he might have sneaked into the full England World Cup squad Dunn was realistic: "It didn't affect me really because I never really believed it,"
"I'm one of those people who believes that if it happens, then it happens and if it doesn't, it doesn't," he said...
"This is my last year in this age group so as captain, I'd like to go out there and I'd like to win it, and the rest of the lads and the manager are thinking the same as well."