Talk:Warfare Overseers/@comment-3410662-20121229045529/@comment-27202257-20121229210440

We know that he sent them, though, because of this note, which can be found by one of the dead Overseers near the bridge.

Remember that everything Corvo does for the Loyalists happens over a period of days, or weeks at most. Campbell probably ordered the squad out before he was eliminated by Corvo and it took them that long to get ready for it. Alternatively, some parts of the squad might have been able to evade the assassins for longer than others.

This note also confirms that the Overseers were at the bridge, but they assassins sprung a trap on them.