The Laconia Incident: The WWII Rescue That Changed Submarine Warfare

The Laconia incident is one of the most uncomfortable stories of World War II because it refuses to fit neatly into the usual categories of hero and villain.

On 12 September 1942, the British troopship RMS Laconia was torpedoed in the Atlantic by the German submarine U-156. That part of the story sounds familiar: a U-boat, a wartime ocean crossing, a ship going down in the dark.

But what happened next was anything but ordinary.

When U-156’s commander, Werner Hartenstein, surfaced and discovered that the sea was full of civilians, British personnel, Polish guards, and Italian prisoners of war, he began a rescue operation. He brought survivors aboard, towed lifeboats, broadcast his position openly, and even sailed under Red Cross banners.

Then an American B-24 Liberator appeared overhead.

It attacked anyway.

The result became known as the Laconia incident, a tragedy that helped end U-boat rescue efforts and pushed the Atlantic war deeper into unrestricted submarine warfare.

What Was RMS Laconia?

Before the war, RMS Laconia was a civilian ocean liner. Built in 1921, she had once carried passengers around the world. By 1942, the war had turned her into a troopship.

At the time of her sinking, Laconia was sailing from Cape Town toward Freetown. She carried thousands of people, including:

British crew and military personnel
Civilian women and children
Polish soldiers guarding prisoners
More than 1,800 Italian prisoners of war

Her captain was Rudolph Sharp, a man who had already survived one of Britain’s great maritime disasters. He had previously commanded RMS Lancastria, sunk by German bombers in 1940 during the evacuation from France.

Laconia was armed, which made her a legitimate wartime target under the rules being used at sea. That detail matters. Hartenstein did not know he was attacking a ship packed with Italian POWs and civilians.

At around 10:22 p.m., U-156 torpedoed her.

A Ship Goes Down in the Atlantic

The sinking itself was chaos.

Laconia did not have enough lifeboat space for everyone. Some boats could not be launched properly because of the ship’s heavy list. Survivors went into the water in darkness, surrounded by wreckage, panic, and blood.

The Italian prisoners suffered terribly. Many had been held below decks and had to break out as the ship sank. Some were prevented from boarding lifeboats. Others were attacked when they tried to climb aboard. Survivors later described sharks in the water.

By the time U-156 surfaced, Hartenstein expected to find senior officers or a manageable number of survivors.

Instead, he saw more than 2,000 people struggling in the Atlantic.

That was the moment the story changed.

The German U-boat That Began a Rescue

Hartenstein realized that many of the people in the water were Italian POWs, civilians, and noncombatants. He began rescuing them.

This was not a small gesture. A submarine was not built to carry hundreds of shipwrecked people. Space was already brutally limited for its own crew. Yet U-156 took survivors onto the deck and inside the vessel, then began towing lifeboats.

Hartenstein also sent messages asking for help. He broadcast his position openly and promised not to attack any ship that came to assist, as long as he was not attacked.

That message was extraordinary.

A German submarine commander had effectively announced his location in the middle of the Atlantic and asked Allied shipping to help rescue survivors from a British ship he had just sunk.

Other submarines joined the rescue, including German U-boats and the Italian submarine Comandante Cappellini. Vichy French ships were also sent to collect survivors.

For a brief moment, the war at sea stopped behaving like war.

Then the aircraft arrived.

The American B-24 Attack

On 16 September, U-156 was moving on the surface with survivors visible aboard and lifeboats in tow. A Red Cross flag was draped across the gun deck.

A U.S. Army Air Forces B-24 Liberator, piloted by Lieutenant James D. Harden, spotted the submarine.

Hartenstein signaled to the aircraft. A British officer aboard the submarine also sent a message making the situation clear: there were Laconia survivors on board, including soldiers, civilians, women, and children.

The aircraft reported the situation to base.

The order came back: attack the submarine.

Captain Robert C. Richardson III, the senior officer on duty, ordered the B-24 to sink U-156. He later claimed he did not know the rescue was Red Cross-sanctioned and feared the submarine could threaten Allied operations or discover the secret Ascension Island airbase.

Harden returned and attacked.

Bombs and depth charges fell near U-156. One hit among the lifeboats being towed behind the submarine, killing survivors. Hartenstein cut the lifeboats loose, ordered survivors off the deck, and crash-dived to save his boat.

The bomber crew later claimed they had sunk U-156.

They had not.

They had sunk lifeboats.

The Rescue Continued, But the Damage Was Done

Despite the attack, other submarines continued rescuing survivors for a time. U-506, U-507, and Comandante Cappellini picked up more people and attempted to transfer them to French ships.

Then U-506 was also attacked by U.S. aircraft.

The rescue operation became increasingly dangerous. Submarines carrying survivors could no longer remain safely on the surface. Commanders were told to put some survivors into rafts and continue toward rendezvous points.

Not every commander obeyed the harshest interpretation of those instructions. Some chose not to cast survivors adrift.

Eventually, French ships including Gloire, Annamite, and Dumont-d’Urville rescued hundreds of people.

But the final numbers were grim.

Roughly 976 to 1,083 people survived. Around 1,658 to 1,757 died, most of them Italian prisoners of war.

The Laconia incident had begun with a torpedo. It ended as a moral disaster for nearly everyone involved.

The Laconia Order

The most important consequence came almost immediately.

On 17 September 1942, Admiral Karl Dönitz issued what became known as the Laconia Order. It forbade U-boat crews from attempting rescue operations for survivors of ships they sank.

Before this, U-boats sometimes helped survivors with food, water, medical aid, or directions to land. Bringing survivors aboard was rare, but basic assistance was not unheard of.

After Laconia, that changed.

Dönitz’s message was clear: submarine security came first. Survivors were to be left in the sea.

The Atlantic war was already brutal. The Laconia incident made it colder.

Why the Incident Became So Controversial

The controversy did not end in 1942.

At the Nuremberg trials, prosecutors tried to use the Laconia Order as evidence against Dönitz. The argument was that the order encouraged illegal treatment of shipwrecked survivors.

But this move backfired.

The defense was able to bring up the full story of the Laconia incident, including the American attack on submarines involved in rescue operations. That embarrassed the prosecution because it showed that Allied forces had also behaved harshly at sea.

The issue became even more complicated when U.S. Admiral Chester W. Nimitz provided testimony stating that the United States had practiced unrestricted submarine warfare in the Pacific from the first day it entered the war.

The tribunal still criticized Dönitz’s orders, but his sentence was not assessed on that specific breach of submarine warfare law.

The Laconia incident had become more than a wartime tragedy. It had become a legal and moral problem no side could use cleanly.

The Human Cost Behind the Naval Debate

It is easy to reduce the Laconia incident to rules, orders, and submarine doctrine. That misses the point.

This was a disaster lived by people in the water.

One survivor, Doris Hawkins, spent 27 days adrift in a lifeboat before reaching the coast of Liberia. She lost a child she had been caring for when a lifeboat overturned during the sinking. After the war, she visited families of those who died and returned personal mementos entrusted to her by people in their final moments.

Stories like hers strip away the abstract language of naval warfare.

The Laconia incident was not just about whether a submarine could fly a Red Cross flag. It was about people who survived a torpedoing, survived the sinking, reached lifeboats, and were then bombed during a rescue attempt.

That is what makes the story so hard to forget.

What the Laconia Incident Reveals About War

The Laconia incident exposes one of the ugliest truths of total war: mercy becomes dangerous when the enemy no longer trusts it.

Hartenstein tried to rescue survivors. Allied commanders suspected deception or strategic danger. The bomber attacked. Dönitz used the attack as justification to forbid future rescues.

Each step made sense to someone in the chain of command.

Together, they produced catastrophe.

That is why the Laconia incident still matters. It shows how quickly humanity can be punished in wartime, and how one decision can harden the rules for everyone who comes after.

Key Takeaways

The Laconia incident began when U-156 sank RMS Laconia on 12 September 1942.
The ship carried British personnel, civilians, Polish guards, and large numbers of Italian POWs.
U-156’s commander, Werner Hartenstein, began rescuing survivors and broadcast his position openly.
A U.S. B-24 attacked the submarine despite survivors being visible and rescue signals being sent.
The incident led directly to the Laconia Order, which forbade U-boat crews from rescuing shipwrecked survivors.
The controversy later resurfaced at Nuremberg, where the case became awkward for the Allies as well as Germany.

The Laconia incident was the moment mercy at sea became a liability.

Conclusion

The Laconia incident is not remembered as widely as the great battles of World War II, but it deserves to be.

It had everything: a torpedoed liner, thousands in the water, a German submarine rescue, an American air attack, diplomatic embarrassment, and a naval order that changed the behavior of U-boats for the rest of the war.

More than that, it forces an uncomfortable question.

When war turns rescue into risk, how long can humanity survive inside the rules of combat?

The Laconia incident did not just sink a ship. It helped sink the last fragile habits of mercy in the Atlantic submarine war.