Take down

"I think what's happened is that the more we put pressure on the al-Qaida leadership in the tribal areas in Pakistan and I would say that as a result of our operations, that the Taliban (al-Qaida) leadership is probably at its weakest point since 9/11 and their escape from Afghanistan into Pakistan," he said.
But having said that, the more we continue to disrupt al-Qaida's operations, and we are engaged in the most aggressive operations in the history of the CIA in that part of the world, and the result is that we are disrupting their leadership, he added.
We've taken down more than half of their Taliban leadership, of their al-Qaida leadership and we just took down number three in their leadership a few weeks ago, he said.
We continue to disrupt them. We continue to impact on their command-and- control and the NATO forces continue to impact on their ability to plan attacks in this country, Panetta said.

Please explain to me what "take down" means in this context.

Source : http://timesofindia.indiatimes.com/World/US/Osama-bin-Laden-is-hiding-in-tribal-areas-of-Pakistan-CIA/articleshow/6099052.cms