In this episode of Militia Historia, we dive into the Attack on Mers-el-Kébir (3 July 1940)—one of the most dramatic, controversial, and strategically important naval actions of the early Second World War.

Only weeks after the fall of France, Britain faced a terrifying question: what happens if the powerful French fleet is seized or controlled by Nazi Germany? With the Royal Navy fighting for survival, Winston Churchill and the War Cabinet launched Operation Catapult—a plan to neutralise French warships before they could ever be turned against Britain.

Off the coast of Algeria at Mers-el-Kébir, Admiral James Somerville’s Force H confronted Vice-Admiral Marcel-Bruno Gensoul and issued an ultimatum: sail to British ports, disarm under British control, scuttle the ships, or face destruction. When negotiations collapsed, British battleships opened fire on former allies at close range, striking French ships at anchor and triggering devastating explosions, fires, and heavy loss of life.

In this episode we cover:

• The strategic crisis Britain faced after the French armistice
• Why the French fleet mattered to the balance of naval power in 1940
• The ultimatum at Mers-el-Kébir and why talks failed
• The British bombardment and the fate of the French ships
• The political and moral consequences for Britain, Vichy France, and the wider war
• Why Mers-el-Kébir still matters in debates about alliances, deterrence, and wartime decision-making

If you’re interested in WW2 naval history, Royal Navy operations, and the hard strategic choices that shaped the Battle of the Atlantic era, this is an episode you won’t want to miss.

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