Battle of Cape Bon, 1941: four destroyers ambush two cruisers loaded with fuel

Hidden against the dark mass of the cape, the destroyers were almost invisible. The Italian account, as the British official history records it, says the cruisers could not see them because they had the land behind them, and the Italian account in Difesa Online describes the British ships keeping close under the coast to merge with the heights. The Italians were taken completely by surprise.²

Who won the Battle of Cape Bon and why?

The Allies won. Four destroyers, three British and one Dutch, sank both Italian cruisers within minutes and lost no ship of their own. Surprise won it: the Italians could not see the destroyers against the dark coast, and the cruisers, carrying petrol in drums on deck that hampered their guns, caught fire as soon as the torpedoes struck.³

Background: the battle for the supply routes

In late 1941 the war in North Africa turned on supplies, and above all on fuel. The British Crusader offensive in Libya opened in November, and in December the Axis armies were falling back. Everything they needed had to cross the sea from Italy, and the British were sinking more of it every month.⁴ › The Siege of Tobruk, 1941

The main weapon was Malta. From the island British ships and aircraft struck at convoy after convoy, and on 29 November a second squadron of warships, with the cruisers Ajax and Neptune, arrived to strengthen them. The figures for November were disastrous for the Axis. The British official history, quoting the Italian naval historian Marc'Antonio Bragadin, says 62 per cent of the stores loaded in Italy were lost on the way; the Dutch naval historian Anselm van der Peet, counting ships, finds that only about 30 per cent reached Libya.⁵

The turn of the month made matters worse. Blenheim bombers from Malta sank the merchant ship Capo Faro at the end of November, and on 1 December the Malta warships sank the auxiliary cruiser Adriatico and then the tanker Iridio Mantovani, loaded with fuel for Libya, together with her destroyer escort. The Italian account names the same ships among the losses that drove the navy to use its cruisers.⁶

Fuel was the worst shortage. The British official history singles out the loss of aviation and motor spirit as particularly severe, and the Italian account describes Axis vehicles in Libya unable to move and the aircraft defending Tripoli unable to fly. Rome needed a way to get petrol across quickly.⁷

Cruisers turned into tankers

The Italian navy turned to its warships. Its naval staff decided to rush fuel and supplies to Libya in fast cruisers, and chose the Alberico da Barbiano and Alberto di Giussano of the 4th Cruiser Division, under Admiral Antonino Toscano. A third cruiser, the Giovanni delle Bande Nere, dropped out with engine trouble and was replaced as escort by the small torpedo boat Cigno. The British official history describes the Italians using warships to carry fuel and munitions as a way out of the crisis.⁸

The two cruisers were early ships of the Condottieri class, in service since the early 1930s, armed with eight 152mm guns and built for speed: about 40 knots in van der Peet's account, 37 in the Italian figures. Now they were loaded like tankers. Their cargo was fuel, including aviation petrol for the Axis air forces in Africa, much of it in drums stacked on the open deck. The drums got in the way of the guns: van der Peet says the two after turrets could not be used, and the Italian account says the main turrets could not be trained at all. One spark could turn either ship into a torch.⁹

The crews knew what they were carrying. Van der Peet writes that the petrol was stacked on the afterdecks to the horror of the men, and the Italian account recalls that the danger of the mission was clear the moment the leaking drums of aviation spirit came aboard. The naval staff had not planned a battle at all: the cruisers were sailing as cargo ships.¹⁰

Secrecy was already lost. The British were reading Italian coded signals through the intelligence they called Ultra, and they knew the cruisers' plans. The cruisers sailed from Palermo for Tripoli on the evening of 12 December.¹¹

Armies and commanders

The ships that would meet them were not hunting cruisers. Commander Graham Stokes's 4th Destroyer Flotilla had left Gibraltar on 11 December, bound for Alexandria to reinforce the Mediterranean Fleet. Stokes flew his pennant in HMS Sikh, which had fought in the hunt for the Bismarck that May. With him sailed HMS Maori, HMS Legion and the Dutch destroyer Isaac Sweers.¹²

The Italian force was commanded by Admiral Toscano of the 4th Cruiser Division. His task was to deliver the cargo, not to fight: two cruisers that could barely use their guns, with one small torpedo boat for an escort.¹³

Two calculations

Both commanders had to judge time and distance. Italian aircraft had seen the destroyers about sixty miles east of Algiers, steaming east, and Toscano worked out that they could not reach Cape Bon before he had passed it. Van der Peet reconstructs the Italian reckoning: at the speed the destroyers had been seen making they would not arrive until the next morning, and even at 28 knots not before about 3:30 a.m., more than an hour after the cruisers were due to round the cape. The Italian staff judged the margin enough, and the petrol was wanted urgently in Libya.¹⁴

Stokes, for his part, received a report of the Italian cruisers on the way east. His flotilla had not been sent to stop them, but he raised speed, first to 28 knots and then to 30, in the hope of intercepting them off Cape Bon himself. Van der Peet calls him an officer of initiative and offensive spirit.¹⁵

The battle in phases

A race to the cape

The destroyers were faster than Toscano had calculated, and both groups arrived off the cape within minutes of each other in the early hours of 13 December.¹⁶

An RAF Wellington from Malta found the Italian ships and reported them. In the British and Dutch accounts Toscano, sure that he had been seen and fearing an air strike on his inflammable cargo, turned back to the north for a while, which took his cruisers straight toward the destroyers. The Italian account remembers it differently: there, Toscano judged it too late to turn back again and pressed on at full speed.¹⁷

Under the cliffs

At about 2 a.m. the lookouts on Sikh saw flashing lights and the outlines of two large ships heading south, which then vanished behind the cape. Rounding it, Stokes found them steaming back toward him. With Sikh in the lead and Legion behind her, he took his destroyers close in under the high land, where the cliffs behind would hide them.¹⁸

The destroyers fired torpedoes and opened fire at close range, about 1,000 yards in the British account and 1,200 meters in the Dutch one. Van der Peet gives the time as 2:23; the Italian account puts it at 3:15. The enemy was completely surprised. Two torpedoes from Sikh hit the leading cruiser, the Da Barbiano, which burst into flames from end to end, most likely fed by the fuel on her deck. Within ten to fifteen minutes she rolled over and sank, and Admiral Toscano went down with her.¹⁹

The Di Giussano

The second cruiser managed one salvo, which fell on the Tunisian shore. Almost at once a torpedo from Legion hit her, two in the Italian account, and the destroyers followed with more torpedoes and gunfire; van der Peet credits a hit to Maori and describes the Isaac Sweers raking the listing cruiser with her guns. Within minutes she too was ablaze and sinking.²⁰

The little Cigno suddenly loomed out of the dark and ran down the destroyer line at point-blank range. Every Allied ship fired at her in passing, but she escaped.²¹

Turning point: five minutes in the dark

The destroyers did not stop. They held their course and went on, and soon afterward reached Alexandria as the first of the reinforcements for the Mediterranean Fleet. The fight itself had lasted only minutes: less than six by van der Peet's reckoning, less than five by the Netherlands Institute of Military History. Behind them the Di Giussano sank about an hour after she was first hit.²²

Counting the cost

More than 900 Italians died, Admiral Toscano among them. The Cigno picked up about 500 survivors. Others reached the Tunisian shore: van der Peet counts more than a hundred, and the Italian account says local people helped to rescue them. The Allied destroyers came through without loss.²³ › 13 December in military history

The cargo was lost too. For the Axis armies in Libya the sinking of the two cruisers meant that the fuel they had been waiting for went to the bottom with them, and van der Peet counts the action as a direct blow to the Axis war on land.²⁴

Aftermath

The British official history judges that for the Italians the affair was one more unpleasant reminder of the Royal Navy's training and equipment for night fighting. S. W. Roskill, the Royal Navy's official historian, calls it a brilliant action, but adds that it was more than offset by losses elsewhere. Within a week, on 19 December, Italian frogmen riding human torpedoes slipped into Alexandria harbor and crippled the battleships Queen Elizabeth and Valiant.²⁵

Legacy and memory

In the Netherlands the action is remembered through the Isaac Sweers. The Netherlands Institute of Military History calls her story one between victory and ruin. A month after Cape Bon, when HMS Gurkha was torpedoed in January 1942, the Dutch destroyer rescued more than two hundred of her crew, nearly all of them. In November 1942, during the Allied landings in North Africa, a German U-boat sank the Isaac Sweers herself.²⁶

Naval writers still use Cape Bon as a lesson. Van der Peet, writing in 2021 for Dutch naval officers, presents it as a textbook case of fast, aggressive and decisive action at sea: a commander who did not hesitate to attack a stronger enemy close inshore, beside a minefield, trusting surprise and speed. He quotes the British commander in chief's verdict that the action was skillfully conducted and reflected credit on the training of the British and Allied ships, and a Royal Navy analysis that put the result down above all to months and years of constant training.²⁷ › Battle of Cape Spartivento, 1940