This is how he was quoted while describing the incident in a report carried by a Western wire service. “Pakistan had a very difficult year, with a huge wave of suicide bombers, the Lal Masjid event, 257 soldiers captured by 20 insurgents.” (ROFLOL)
There was no doubt that he was sarcastic while referring to the incident. He made sure that he highlighted the figures to make the point as to how Pakistan Army was faring in its campaign against the militants. So he gave those figures about 257 soldiers getting captured by 20 insurgents only.