Welcome to the show, everyone. I'm Eleanor Finch, and today we're examining a historical mystery that was completely warped by colonial bias, only to be solved decades later by modern science. And, Simon, I want to start in 1947, on the streets of the ancient city of Mohenjo-Daro, in what is now Pakistan. The British archaeologist Sir Mortimer Wheeler is standing over a trench containing 40 skeletons, and with the stroke of a pen, he declares he's found a massacre. Forty skeletons? That's a tiny number for a massive city, isn't it? But let me guess, he had a culprit in mind already? He did. He pointed the finger at none other than Indra, the Vedic storm god. In the Rig Veda, India's oldest sacred text, Indra is called Purandara, which literally translates to destroyer of forts or destroyer of strongholds, So Wheeler looked at these 40 bodies, read the ancient hymns describing the destruction of walled cities, and concluded that an invading army of Indo-Aryan chariot warriors had swept through and annihilated the entire Indus Valley civilisation. Wow. So he used a religious text as a literal crime report. It sounds incredibly dramatic, but it's also so typical of the 1940s colonial mindset, right? Like, if a great civilization fell, it had to be because of a spectacular military conquest by outsiders, rather than anything the locals did or experienced. Precisely. It was a time of empire, and British archaeologists heavily favoured external migration and invasion to explain any major cultural shift. They completely ignored the sheer, staggering scale of what the Indus civilisation actually was. We are talking about a Bronze Age society that, at its peak, covered up to 800,000 square kilometres. That's larger than ancient Egypt and Mesopotamia combined. And their cities were incredibly sophisticated. I mean, Mohenjo-daro and Harappa weren't just chaotic clusters of mud huts. They were built on a precise grid system, oriented north to south and east to west. They had standardized brick sizes, a mysterious 400-sign script we still can't decipher, and a sewerage system with underground brick-lined drains that was better than what most of Europe had in the 19th century. Exactly. They even had massive public works, like the Great Bath of Mohenjo-daro and 50-metre-long granaries. There's almost no evidence of a ruling military elite – no palaces, no massive royal tombs, and, bizarrely, almost no weaponry or signs of warfare in the archaeological layers. Yet Wheeler's dramatic invasion myth became the dominant narrative for decades. So how did we finally bust this myth? Because I'm assuming modern forensic science didn't look kindly on Wheeler's massacre theory. Not at all. When archaeologists re-examined those 40 skeletons in the 1960s, the entire story fell apart. First, the bodies weren't all buried at the same time. They were staggered burials from different periods, some even showing signs of formal burial practices. There were no weapon trauma wounds consistent with a sudden, violent sack of the city. But the absolute killer blow to Wheeler's theory was the timeline. The timeline? Let me guess. The dates didn't align? They weren't even close. The decline of the mature Indus cities happened around 1900 BCE, but the Vedic period, when the Rig Veda was composed, doesn't begin until around 1500 BCE. There's a gaping chasm of at least 200 years, possibly up to 400 years, between the abandonment of the cities and the arrival of the people who wrote the hymns. Indra couldn't have destroyed the cities because they were already ghost towns when his worshippers arrived. So Indra had a pretty solid alibi. But if it wasn't a sword-wielding army, what actually emptied these massive, structured metropolises? The culprit was far more slow-moving and devastating – a catastrophic failure of the monsoons. Recent research, led by Cameron Petrie at Cambridge, has shown that between 2100 and 1900 BCE, the region experienced severe monsoonal instability, leading to a sustained 200-year drought. The rivers that fed these massive agricultural systems began to dry up or shift course, including the legendary Sarasvati River. 200 years of failing rains. That is a terrifyingly long time. I mean, if you can't grow food to support 40,000 people in Mohenjo-daro, the whole urban system just collapses. It does, and the human toll was heartbreaking. Forensic bone analysis by researcher Gwen Robin Shug revealed clear markers of this slow-motion disaster. High rates of malnutrition, stunted bone growth and high infant mortality. She also found a sharp spike in blunt force trauma on the bones from the final phases of the cities, indicating a surge in interpersonal violence. When food and water run out, society breaks down from the inside. Right. It's not a glorious, dramatic battle against an invading army. It's neighbors fighting neighbors over the last scraps of grain. But what happened to the survivors? Where did they go? They didn't vanish. They adapted. We see a clear, gradual shift in settlement patterns. People abandoned the hyper-arid northwest and migrated southeast toward the Ganges basin, where the rainfall was slightly more reliable. But they couldn't maintain their massive cities. The complex script, the standardised weights, and the grand brick architecture disappeared. They became a decentralised society of small, simple farming villages. That is so poignant. It's a complete restructuring of a civilization. They traded their grand, grid-planned cities for survival in modest farming communities. It makes you realize that the real story of history is rarely about the spectacular wrath of invading gods— It's written in the quiet, desperate steps of families packing up what little they have and walking east, searching for rain. Well said, Simon. And that is where we leave it for today. Thank you for listening, and we'll see you next time.
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