The Dallas Cowboys have faced teams with undefeated records late in the season very rarely; in fact, I could only find three games in their history where they played teams who were better than 8-0.
The first was in 1990, when they faced Joe Montana and Jerry Rice at their peak. The game was at Texas Stadium and the young Cowboys were no match for the defending champion 49ers, losing 24-9.
The next year, Dallas went up against the Redskins, who were 11-0 and in the midst of a Super Bowl season. Aikman got injured in the 3rd quarter but Steve Beuerlein came in and played well, leading the talented Cowboys to a 24-21 upset at RFK. I remember this classic for Jimmy Johnson taking chances all game long - going for 4th downs, onside kicks and Hail Mary's. Aikman even threw a bomb on the first play of the game (can't remember Garrett ever calling that to start off a game). Video from after the game showed Johnson telling the team in the locker room that (and I paraphrase), "when you face a gorilla, you don't hit him lightly - you hit him as hard as you can with everything you got!" But I also recall the offense running the ball down the defense's throat and controlling the clock on their way to the game-clinching field goal. What a great game!
Most of us probably remember the third game, when Peyton Manning came to town in 2006 with their annual undefeated streak. The Colts were 9-0 and led Dallas at halftime 7-0. It was Romo's 4th game as a starter and he was superb, hitting clutch passes to Terry Glenn and Anthony Fasano (!) to help the Cowboys take the lead in the 4th quarter and hang on to the win, 21-14.
Not sure if there are any lessons to be learned from any of these games. Romo has sort of been in this situation before, except his moment was at home. I'd like it if Wade and Garrett somehow imitate the strategy that Jimmy Johnson employed nearly 20 years ago - take chances and leave nothing on the field. This is not the time to play "not to lose." The season is on the line.