I was particularly interested in one of these disclosures, which came in the shape of a video that the Pentagon had refused to release despite a Freedom of Information Act request.

When WikiLeaks did release the video, it was obvious why the US generals had wanted to keep it secret. Three years earlier, I had been in Baghdad when a US helicopter machine-gunned and fired rockets at a group of civilians on the ground who its pilots claimed were armed insurgents, killing or wounding many of them.

Journalists in Iraq were disbelieving about the US military's claims because the dead included two reporters from the Reuters news agency. Nor was it likely that insurgents would have been walking in the open with their weapons when a US Apache helicopter was overhead.