Coventry was sacrificed. ENIGMA intercepts indicated that the Luftwaffe had targeted Coventry. Rather than let the Nazi high command know that their ENIGMA coding system had been compromised, Churchill elected not to alert the RAF or civil authorities in Coventry.
I always thought of the Coventry raid as happening during the height of the Battle of Britain, back during the days of August and September. Even though the Germans are now gearing up to attack the USSR, it appears the Luftwaffe is still fully committed against Britain, if mostly at night.
PzLdr posted about this the day before yesterday. Vanders9 responded that "latest historical thought" was that Churchill might not have known Coventry was targeted. It would be useful if someone provided support for one side or the other on this question.