Petry's point shot through traffic on the power play gave the Canadiens a 1-0 lead at 6:10 of the first period. White redirected a pass from Derek Stepan for a power-play goal at 12:08 to tie the game 1-1.
"They came out with a heavy, heavy push at the start, which we knew they would do," Senators coach D.J. Smith said. "We held it, got out of the first 1-1. At the end of the day, we lost the special teams battle (1-for-6 on the power-play; 2-for-3 on the penalty kill). But 5-on-5, I thought we played really hard, tracked (pucks), worked. There's nothing to be faulted for that effort."
Anderson scored on a rebound for a 2-1 lead at 1:35 of the third period after Jonathan Drouin and Suzuki were each stopped by Murray.
"We didn't have everyone going tonight," Julien said. "This was our fourth game in six nights, and sometimes fatigue sits in and you get those challenges, but the main thing is you find ways to win hockey games. I think we were good enough in that third (period) at defending that we were able to win."
Senators rookie forward Tim Stutzle, who had three shots on goal and drew three penalties in 17:37 of ice time, had his three-game goal-scoring streak end.
"When a player's that dangerous, you'd have to be crazy if you're on the other team and you're not aware when he's out there," Smith said of Stutzle. "The penalties that he drew, they're all high sticks, hit him in the face, but when you're that fast, that happens. And he handles it fine; he's been a superstar player his entire life."
NOTES:Julien became the fifth coach to win 200 games with the Canadiens (Toe Blake, 500; Dick Irvin, 431; Scotty Bowman, 419; Michel Therrien, 271). He is 200-172-48 with 10 ties in 430 games over eight seasons (2002-06; 2016-21) … The Canadiens are 4-0-0 following a loss.