[7Z7]

The phrase is much older than that..

>Grose's The Dictionary of the Vulgar Tongue - 1811:

>>To send one to Coventry; a punishment inflicted by officers of the army on such of their brethren as are testy, or have been guilty of improper behaviour, not worthy the cognizance of a court martial. The person sent to Coventry is considered as absent; no one must speak to or answer any question he asks, except relative to duty, under penalty of being also sent to the same place. On a proper submission, the penitent is recalled, and welcomed by the mess, as just returned from a journey to Coventry.[0]

https://en.wikipedia.org/wiki/Send_to_Coventry

[roninb]

Wow, I wonder how effective time-out was on infantrymen of the early 19th century and how often it was enforced. It seems like an analog to solitary confinement while still forcing you to be a contributing member of your armed forces.