Armed Conflict (Parliamentary Approval)

I am most grateful to my right hon. Friend, who has been extremely generous in giving way this afternoon. I would like to take up a point arising from what he said before he spoke about intelligence. He said that it would not, in his conception, be necessary to have a parliamentary vote where we were taking military action under treaty obligations. Earlier on, he said that one example of where, in his conception, a parliamentary vote would have been required was Afghanistan. Surely we took military action there as a result of an attack on an ally, which triggered article 5 of the Washington treaty. Does he believe, on reflection, that that was or was not a case requiring a parliamentary vote under his proposals?