The commander, Col. Joseph Anderson, of the Second Brigade of the Army's 101st Airborne Division, said he did not learn until this week that the site, Al Qaqaa, was considered sensitive, or that international inspectors had visited it before the war began in 2003 to inspect explosives that they had tagged during a decade of monitoring.
Colonel Anderson, who is now the chief of staff for the division and who spoke by telephone from Fort Campbell, Ky., said his troops had been driving north toward Baghdad and had paused at Al Qaqaa to make plans for their next push.
"We happened to stumble on it,'' he said. "I didn't know what the place was supposed to be. We did not get involved in any of the bunkers. It was not our mission. It was not our focus. We were just stopping there on our way to Baghdad. The plan was to leave that very same day. The plan was not to go in there and start searching. It looked like all the other ammunition supply points we had seen already."
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