The British War Cabinet decided to attack the German oil industry, communications centers, and forests and crops; attacks on industrial areas were to focus on the Ruhr region. Also, due to the costly daylight bombings, attacks were to be launched at nights. On the same day these directives were issued, the RAF began attacking industrial targets in the Ruhr, with 99 bombers flying the first mission. The decision to begin bombing civilian property outside of combat zones was the direct result of the German bombing of Rotterdam on the previous day
