Can't find captured commando

[J691]

In the Colditz castle mission I lost Tread!

I was using him to try and kill the 3 patroling soldiers(patrolling around the church). It didn't seem to work so I hid him behind a building near the church and was doing some exploring with my spy. Next thing I know he was captured and bound up in some building! I've been looking for him, but haven't had much success. Has anybody had this problem before and do you know where I might find him?

Thanx