It was also the first time McM had been shutout since the 2008 season (an 18-0 loss to Texas Lutheran).
"I was really disappointed the way we played the second half," McM head coach Hal Mumme said. "We weren't competitive enough.
"We are a really young team and the handful of seniors we have are having a hard time getting some of the freshmen on the same page. We made a lot of mistakes.
"We needed to score in the first half when we had the chance and we didn't do it."
After some good defense kept things close early on, a fumble by the War Hawks' Chris Simpson at the ACU 19 not only squelched a scoring opportunity, but eventually led to the Wildcats registering the first points of the day.
ACU embarked on an eight-play, 81 yard scoring drive, culminating in a 13 yard run by Charcandrick West. The PAT made it 7-0 with 7:20 left until the intermission.
The Wildcats would add two more scores before the half to lead 21-0 - all scored within a span of 6:32 minutes - going into the locker room.
Senior quarterback Jake Mullin completed 37 of 59 passes for 288 yards, but was under constant pressure from an ACU front that sacked the War Hawks' signal-caller nine times in the game.
Greg Livingston had five catches for 79 yards and Eric Shaffer made seven grabs for 55 yards.
On defense, secondary men Desmond Guy and Ryan Williams had eight and seven tackles, respectively. Williams also made a touchdown-saving interception in the end zone in the first quarter.
The second half held much of the same for the War Hawks, as ACU put up 23 points in the third quarter and one touchdown in the fourth. On the day, ACU scored seven times on drives of 50 yards or less.
"We played a Southland Conference school last year and these guys (ACU) are as good as a lot of them," Mumme added. "Hats off to Kenny (ACU head coach Collums). He did a great job getting his team ready."
While putting this game in the rearview mirror, Mumme's War Hawks will have a tall order on tap next week when the team travels to Lake Charles, La., to face NCAA I (FCS) foe McNeese State on Saturday.