A day after most of the N.F.L. engaged in at least some form of demonstration during the national anthem, the Dallas Cowboys, along with the team’s owner, Jerry Jones, linked arms on the University of Phoenix Stadium field Monday night and collectively took a knee before the anthem was played. The Arizona Cardinals, the Cowboys’ opponent, linked arms in the end zone with some military personnel, and by the time the pop star Jordin Sparks had begun singing the anthem, Mr. Jones and his team’s players had moved to the sideline and were standing with linked arms. The crowd, which had booed as the Cowboys were kneeling, let out some loud cheers at various points during the song. After the hubbub of the dramatic opening had died down, the Cowboys beat the Cardinals, 28-17, as Dak Prescott threw two touchdown passes and ran for another, while DeMarcus Lawrence chipped in with three sacks and numerous quarterback hits. Mr. Jones addressed the news media after the game, saying he had never been more proud of his organization. He said he believed the demonstration was not a departure from his previous comments in which he had said he would not tolerate players protesting during the anthem, and that the team was unified in that regard. “It was real easy for everyone in our organization to see that the message of unity or equality was being pushed aside or diminished by the controversy,” he said.