Alexander the Great had been dead for six years when Polyperchon marched on Megalopolis, and the empire Alexander had stitched together through two decades of relentless conquest was already coming apart. The Wars of the Diadochi — the wars of the Successors — would consume the Greek world from 321 to 281 BC, each of Alexander's generals fighting to carve out whatever he could hold. When Antipater, the old regent who had managed Greece through Alexander's long absence, died in 319 BC, he passed his authority not to his own son Cassander but to Polyperchon. Cassander, furious at the slight, fled to Asia Minor and allied himself with Antigonus. Polyperchon held the titles; Cassander held the ambition.

Megalopolis, a large and influential city in the Arcadian highlands, had sided with Cassander. For Polyperchon, reducing it was both military necessity and a demonstration that his regency meant something. He marched into the Peloponnese with his Macedonian army and its most fearsome weapon: a train of war elephants, the heavy armor of antiquity's battlefield.

Polyperchon set up two camps before the city walls — one for his Macedonian troops, one for his allied contingents — and put his engineers to work. They raised wooden siege towers and tunneled beneath Megalopolis's fortifications. Eventually three towers and a section of wall collapsed, opening breaches that the attackers poured through. The defenders met them in the rubble.

The fighting in those gaps was brutal. Macedonian soldiers, veterans of Alexander's campaigns, were held back by men who understood that the city behind them was their home. After heavy losses on both sides, the attackers withdrew. Through the night, Damis's defenders labored in the darkness, filling the breaches with wooden stockades, stationing archers and catapult crews on the makeshift walls to slow any dawn assault. They had bought one night. Polyperchon decided it wasn't enough and ordered his elephants forward.

War elephants were psychological weapons as much as physical ones. Their size and noise could shatter cavalry and break infantry formations, and Polyperchon had learned to use them. What he apparently did not know was that Damis had received intelligence of the plan.

During the same night the defenders rebuilt the stockades, they drove iron spikes, hooks, and nails into the wood — a bristling field of metal set just at the height an elephant would reach when trying to push the barricade aside. Damis also ordered his men to fall back from the stockades when the elephants came, not wanting them caught in the chaos, and instead fire bows and catapults from the adjacent walls.

When the elephants reached the stockades and tried to tear them down, their trunks found iron. The pain drove them back. They panicked. A panicking war elephant turns on whatever is behind it, and the stampede that followed tore through Polyperchon's own forces. His assault collapsed. A few weeks later, his army broke camp and marched back toward Athens.

The failed siege damaged Polyperchon's standing in ways that a battlefield defeat alone might not have. Greek cities that had hedged their bets began moving toward Cassander. Antigonus destroyed Polyperchon's fleet at Byzantium. Cassander pushed into Macedon itself. Within a few years, Polyperchon was reduced to a minor figure in the wars he had once been positioned to lead.

For Megalopolis, survival had come at a real cost — the heavy fighting at the breaches extracted lives from both sides, and the city had endured weeks of siege before the elephant counterattack ended it. No ancient source records the defenders' casualties with precision, but the scale of the assault makes clear this was not a symbolic resistance. These were men and women defending their homes against one of the most powerful military forces of the era. The iron spikes in the stockades were not magic; they were necessity born of intelligence and desperation. Damis, the Alexandrian veteran turned city defender, had simply out-thought the general with all the elephants.

Modern Megalopolis sits at approximately 37.40°N, 22.13°E in the Arcadian highlands, a valley ringed by rolling hills that once gave the ancient city both strategic depth and natural protection. The Alpheios River runs nearby, threading through the uplands that made this region so important to Hellenistic-era power brokers. Approaching from Kalamata International Airport (LGKL), roughly 60 km to the southwest, the terrain rises steadily into the mountains of central Arcadia. At 5,000–8,000 feet, the patchwork of cultivated valleys and forested ridges spread below gives a clear sense of why a fortified city here — commanding the approaches to the central Peloponnese — was worth fighting over. A coal power plant marks modern Megalopolis from a distance; the ancient city's agora, one of the largest in Greece, is an archaeological site on the town's western edge.