Fictional representation vs reality when assuming command.

Occasionally in films you see a senior officer removed from command in the field because they give a manifestly illegal order and refuse to back down on it if challenged. Generally its done as another senior rank below the OC believe's the OC has begun acting in a manner indicative of mental or emotional instability and places them under arrest/assumes command on the grounds they are not fit to maintain command.

What I am wondering is if this is based on a specific area of military law, if theres an actual law that a senior officer can be relieved of command under in a field situation or whether its just something that if it ever needed to be done would just be done on common sense grounds?
I suspect if it was legal then 3Bn REME might have been relieved of their problem some time ago! 8O

3Bn Morale Page

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