Rooney picked up a red card for this in the last 17 minutes of the no consequence game against Montenegro and thus ended up becoming the second player after Beckham to get 2 reds while playing for England.
Capello had the following to say ..
"You can't understand why. I can't enter into the head of Wayne Rooney when he plays. I can speak to him before the game, and I can substitute him. I can find different solutions. But you cannot understand the reaction of the players during the game, why things happen. Not just Rooney. Here he was not happy because he had missed some control and passes. His reaction was to kick his opponent."