We see cases where a regular soldier is 'absent' at roll call or even listed as AWOL only to find they had a good excuse. Taken prisoner is a very good excuse. I don't know. Maybe there were cases of some militia being told to go hunt down a rabid dog or something but it was never recorded. The Militia Man and/or his family may deem that to be 'soldiering'. It's all in the individual's story. Right or wrong if you want to be technical, they may have embellished things because the facts left them a bit short on 'glory'.
Pam