Competing in Class B, the Knights scored 71.65 in the event, bettering second-place finisher Greenwood, which finished at 70.25.
New Castle Chrysler placed third overall with a score of 67.75.
Northview also won Best General Effect, Best Guard, and tied for Best Music with Greenwood and New Castle Chrysler.
Greenwood won Best Marching and Best Percussion.
"The first three minutes of the show went pretty well," Northview band director Bob Medworth said. "Then a couple of individual errors caused a major musical tear that lasted for most of the ballad.
"We never really recovered from that. I'm sure the kids were disappointed with this performance."
Medworth said finishing the show will take place this week.
In addition, he said the band will begin preparations for its Pepsi video shoot.
The Clay City Imperial Regiment also competed Saturday, placing first overall in Class D at Warren Central.
The Eels finished with a score of 54.25, while Elwood was second at 51.30. Triton Central finished third at 48.35 and Clinton Central was fourth at 43.95.
Clay City captured Best Music, Best Visual, Best General Effect, Best Auxiliary and Best Percussion in the event.
"Though we were pleased with a first-place finish and happy to sweep all the caption awards, our performance Saturday was not our best run of the show," Clay City director Mark Ziegler said.
Both the Imperial Regiment and Marching Knights will compete at the Avon Invitational Saturday.