In this special episode, we explore the mysterious Japanese O-I superheavy tank—the 120+ ton prototype shrouded in secrecy and speculation. With almost no hard evidence of its existence beyond a few blueprints and scattered reports, the O-I remains one of World War II’s biggest “what ifs.” I’m joined by a guest to discuss its theoretical battlefield role, logistics, and legacy. This is a conversation built on what we know… and what we can only imagine.

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The Medium D was Britain’s bold attempt to build a true fast tank after WWI — powerful, experimental, and ambitious, but ultimately too unreliable to survive.

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This episode explores the Medium Mark C, Britain’s attempt to carry the momentum of WWI tank design into the postwar era. A weapon designed for a war that never came, the Mark C highlights both the ambition and the limitations of early interwar tank development.

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The Mark VIII “International” was unlike any other tank of the First World War. Built through cooperation between Britain, the United States, and France, it was designed to spearhead the massive 1919 offensive. Though it never saw combat, it stands as a symbol of Allied ambition, innovation, and the future of armored warfare.

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Season 2 begins with an introduction to the interwar years. After tracing the birth of the tank in Season 1, this new season explores nearly a hundred vehicles, prototypes, and the people who shaped them between 1919 and 1935. We’ll look at how different nations experimented, debated doctrine, and laid the foundations for the iconic tanks of the Second World War.

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Steel fortresses on rails—armored trains thundered across battlefields from the First World War to the Second, shaping revolutions, civil wars, and empires. In this case study episode, we explore their origins, battlefield use, and eventual decline, from Trotsky’s command train to German Panzerzüge. Once symbols of unstoppable industrial power, these iron leviathans ultimately became relics, remembered as war machines that rode the very rails of war.

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In this episode we wrap up Season 1 with listener questions, a look back at where we’ve been, and a preview of what’s ahead in Season 2. 

I’ll also be dropping a bonus episode during the short break so don’t miss it!

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As Allied tanks grew bolder in the final years of World War I, Germany responded with something new: a weapon built for one purpose—killing tanks. In this episode, we dive into the development and deployment of the Mauser Tankgewehr M1918, the world’s first purpose-built anti-tank rifle. We also explore the rise of armor-piercing ammunition, improvised gun conversions, and the evolving defensive doctrines that sought to counter the growing armored threat. This is the story of how science and desperation shaped the battlefield.

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British tanks shocked the battlefield in 1916 — and German troops had no idea how to stop them. This episode explores the chaos, fear, and improvised anti-tank tactics that marked the first encounters with armor at the Somme.

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As WWI progressed, armored cars got heavier and more dangerous. In Part 2, we explore the Austin, Putilov-Garford, and Ehrhardt E-V/4—machines built not just to scout, but to fight. 

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