two Greek merchantmen and a sortie by the torpedo boats Cesare Battisti and Francesco Nullo was also abortive. Guglielmotti from 21 to 25 August, Galileo Ferraris (25–31 August), Francesco Nullo and Nazario Sauro from 24 to 25 August and the destroyers Pantera and Tigre (28–29 August) failed to find Greek ships in the Red Sea, despite agent reports and sightings by air reconnaissance. Italian aircraft and submarines had little more success. On the night of 5/6 September, Cesare Battisti, Daniele Manin and Nazario Sauro sailed, followed on 6/7 September by the destroyers Leone and Tigre to attack a northbound convoy (BN 4) found by air reconnaissance but found nothing. Further to the north, Galileo Ferraris and Guglielmotti also failed to find BN 4 but Guglielmotti torpedoed the Greek tanker Atlas (4,008 GRT) south of the Farasan Islands straggling behind the convoy. Leone, Pantera, Cesare Battisti and Daniele Manin with the submarines Archimede and Gugliemotti failed to find a convoy of 23 ships spotted by air reconnaissance. Bhima (5,280 GRT) in convoy BN 5 was damaged by bombs and one man killed; the ship was towed to Aden and beached. In August the British ran four convoys in each direction, five in September and seven in October, 86 ships in BN convoys and 72 in BS (southbound) convoys; the Regia Aeronautica managed only six air attacks in October and none after 4 November. The Attack on Convoy BN 7, took place from 20 to 21 October and was the only destroyer attack on a convoy, despite gaining precise information on BN convoys as they passed French Somaliland. The 31 ships of BN 7 were escorted by the cruiser Leander, the destroyer , the sloops Auckland, and with the minesweepers and , with air cover from Aden. Guglielmo Marconi and Galileo Ferraris, stationed to the north, failed to intercept the convoy but on 21 October the destroyers Nazario Sauro and Francesco Nullo with the destroyers Pantera, Leone attacked the convoy east of Massawa; the attackers caused only superficial damage to one ship. Kimberley forced Francesco Nullo aground on an island near Massawa, at the Action off Harmil Island on the morning of 21 October. Kimberley was hit in the engine room by a shore battery and had to be towed to Port Sudan by Leander. The wreck of Francesco Nullo was bombed on 21 October by three Blenheims of 45 Squadron. From