 Complete the following phrase:  On the outbreak of the Second World War, it continued to be used for training bomber crews, disbanding on 4 April 1940 when it merged with 76 Squadron to form No. 16 OTU. On 1 August 1940 it reformed, becoming the first squadron to equip with the new Short Stirling heavy bomber, the first RAF squadron to operate four engined bombers during the Second World War, flying the first bombing raids with the Stirling against oil storage tanks near Rotterdam on the night of 1011 February 1941. It flew on the 1000 bomber raids to 