Zion led the way for the Blue Devils both on offense and defense.
Barrett tallied 33 points in that game while Williamson chipped in 28.
Matt Wilson scored 15 points and Tommy Funk added 10 for Army (1-1), and Funk hit back-to-back 3s to pull the Black Knights to 67-61 with just more than 12 minutes left.
As for Duke, the Blue Devils are as well equipped as any NCAA squad to take down an National Basketball Association franchise.
Reddish hit a driving layup, and he and Barrett each hit 3s on consecutive possessions to push the lead into double figures for good. The Army program has never experienced much success and they play a style of basketball that could lead to easy transition buckets for Duke. That will pay off once conference play begins.
It was the first victory in an opener under third-year coach Jimmy Allen.
"We were forcing shots because we were trying to rely on our talent", Williamson said.
Army edged Marist 73-69 in its season opener on Tuesday night at home, but the Knights are bracing for a big challenge on the road this weekend. It wound up being another blowout, but there were plenty of teachable moments for Krzyzewski: Duke left far too many perimeter shooters open and too often settled for low-percentage shots - the 36 3-pointers attempted were its most since 2016. This time the game is against a much lesser opponent than Kentucky.
No. 25 Miami 75, Hartford 62: Emese Hof scored 21 points, Beatrice Mompremier had 19 points and 13 rebounds, and the host Hurricanes advanced to the semifinals of the preseason WNIT. If Army is able to score and make some shots, they may be able to stay in this game for a little longer than Duke would like.
So even with one impressive outcome, the Blue Devils realize it's barely mid-November.
Funk beat Jones off the dribble to reach the lane before passing the ball out to an open Blackwell, who made a 3-pointer.