An attack lasting nearly nine hours was made on the night of the 12th-13th and was concentrated mainly on the centre, north-west and south-east of the City. Although over 200 incidents were reported, the main Steel Valley largely escaped, and onlv four cases of substantial damage have been reported. The attack on the night of the 15th-16th lasted three hours, and was mainly in the east and east centre; many factories were hit, but only nine of these suffered substantial damage.
Still heavier attacks by combined forces of Blenheims and Wellingtons from Egypt were made on Benina and El Adem aerodromes, where concentrations of enemy aircraft were known to exist. Considerable damage was caused to hangars, administrative buildings, bomb and petrol dumps and aircraft on the ground. It is believed that at Castel Beninto alone thirty-five aircraft were destroyed or damaged. Repeated daylight attacks have also been made on other enemy aerodromes and landing grounds.