By FOX Sports staff
Given Bayern's dominant ways this season, they have spent most of their games coasting to victory but were given a tough test at the Allianz Arena on Wednesday.
However, Arjen Robben netted what proved to be the winner with a 20-yard effort in the 43rd minute to hand his side the victory, one that pleased Heynckes due to the determined performance of his charges.
"All credit to my lads," he said on the club's official website. "My team showed we're not only capable of good and attractive football at the moment, we can scrap too.
"I think we deserved the win. It was a very intense match between two top-class teams. Ultimately, we were the better side by one goal."
Although his side created their fair share of chances, Heynckes admitted their opponents had shown great desire but was delighted that his players followed suit and matched Dortmund's tenacity.
"We had more chances in the first half," he added. "Dortmund covered a huge amount of ground and were very aggressive.
"In a game at this kind of level, it's the tiny things that prove decisive. We were just a touch more aggressive today [Wednesday] and utterly determined to win."
Bayern president Uli Hoeness felt the victory confirmed his club's current superiority over Dortmund - they also lead the two-time defending Bundesliga champions by 17 points in the title race.
"With this game, we have regained our dominance in Germany," he said. "We have a big advantage in the league and we fully deserved to beat them tonight.
"I think that resolves the issue of who is the strongest for this year."
Robben has been a peripheral figure in recent weeks but took his chance with both hands after replacing the suspended Franck Ribery in the starting XI.
"We want to win trophies. Today [Wednesday], we wanted to confirm we're in great shape," the Holland international said post-match.
"It was a game between two fantastic teams, not just in terms of Germany, but also in Europe.
"You have to be happy when you've scored the winner. We're very solid and well-organised.
"In the second half we let them come at us a little too much, but we still had enough chances to have wrapped it up earlier."
Bayern return to action on Sunday when they visit Hoffenheim in the Bundesliga.