September 12 in History

The last emperor of a dynasty claiming descent from King Solomon and the Queen of Sheba was driven from his palace in the back of a Volkswagen Beetle. On September 12, 1974, a committee of military officers known as the Derg deposed Haile Selassie I of Ethiopia, ending a reign that had lasted more than four decades and extinguishing the oldest continuous monarchy in Africa. Selassie had ruled Ethiopia since 1930, earning global admiration for his dignified 1936 appeal to the League of Nations after Mussolini’s invasion. His image as a modernizer and anticolonial statesman made him a towering figure in African politics and the spiritual messiah of the Rastafari movement in Jamaica, which venerated him as the returned Christ. But by the early 1970s, the gap between his international reputation and domestic reality had become unbridgeable. Famine devastated the northern provinces of Wollo and Tigray in 1973, killing an estimated 200,000 people. When journalist Jonathan Dimbleby broadcast footage of starving peasants intercut with scenes of the emperor feeding raw meat to his pet lions, public outrage exploded. Students, taxi drivers, and soldiers began striking, and the Derg formed within the military to coordinate demands for reform. The Derg moved methodically through the summer of 1974, arresting ministers and nobles while professing loyalty to the throne. By September, the pretense was dropped. Selassie was confined to the Grand Palace, then removed to a military installation where he would die under mysterious circumstances the following year, likely smothered on orders from Derg leader Mengistu Haile Mariam. Ethiopia plunged into a Marxist military dictatorship, famine, and civil war that would consume the country for nearly two decades. The Rastafari faithful refused to accept their messiah’s mortality, and Selassie’s legacy remains contested between those who remember a reforming monarch and those who recall a feudal autocrat overtaken by history.

Steve Biko was loaded naked and shackled into the back of a police Land Rover for a 750-mile drive from Port Elizabeth to Pretoria, his brain already swelling from injuries sustained during interrogation. He died on September 12, 1977, alone on the floor of a prison cell at age thirty, and the apartheid government’s initial explanation that he had died of a hunger strike fooled almost no one. Biko had emerged in the late 1960s as the leading voice of the Black Consciousness Movement, a philosophical and political framework that urged Black South Africans to reject the psychological subjugation of apartheid and reclaim pride in their identity. As a medical student at the University of Natal, he co-founded the South African Students’ Organisation and articulated ideas that drew on Frantz Fanon, Pan-Africanism, and the American Black Power movement. His writings and speeches galvanized a generation of young activists who would drive the 1976 Soweto uprising. The security police arrested Biko on August 18, 1977, at a roadblock near Grahamstown. He was held under Section 6 of the Terrorism Act, which permitted indefinite detention without trial. During interrogation at the Sanlam Building in Port Elizabeth, security officers beat him severely enough to cause a brain hemorrhage. Despite visible signs of neurological damage, including slurred speech and inability to stand, police drove him across the country to Pretoria rather than seek proper medical treatment. An inquest initially absolved the police, but the testimony of district surgeon Ivor Lang and pathological evidence contradicted the official account. International condemnation was swift and devastating. The United Nations imposed a mandatory arms embargo on South Africa, the first such action against a member state. Biko’s death transformed him into the most prominent martyr of the anti-apartheid movement, and the 1987 film Cry Freedom brought his story to a global audience. At the Truth and Reconciliation Commission in 1997, five security officers applied for amnesty for Biko’s killing. Their applications were denied.

Jack Kilby pressed his face to a microscope in a Texas Instruments laboratory on September 12, 1958, and watched a tiny sliver of germanium do something no single piece of semiconductor material had done before. The crude device, a transistor, capacitor, and resistor all fabricated on one chip, produced an oscillating sine wave on the connected oscilloscope. The integrated circuit had been born, and the entire trajectory of modern technology shifted in that moment. Kilby had arrived at Texas Instruments only months earlier, a quiet electrical engineer from Great Bend, Kansas. As the new hire, he lacked the vacation time to join his colleagues during the company’s traditional July shutdown. Left alone in the lab, he spent the idle weeks sketching an idea that had nagged at the industry for years: the tyranny of numbers problem, in which increasingly complex electronic systems required so many individually wired components that manufacturing became impossibly expensive and unreliable. His solution was elegant in concept and messy in execution. Rather than connecting discrete components with hand-soldered wires, Kilby proposed building all components from the same semiconductor material on a single substrate. The first prototype, demonstrated for TI executives on September 12, was a rough affair held together with gold wires, but it proved the principle. Six months later, Robert Noyce at Fairchild Semiconductor independently developed a more practical version using silicon and a planar fabrication process that was easier to mass-produce. The integrated circuit launched the microelectronics revolution. Within a decade, NASA was using chips in the Apollo guidance computer. Within two decades, Intel’s microprocessors were powering personal computers. Kilby received the Nobel Prize in Physics in 2000, forty-two years after his demonstration. The chip he built contained a single transistor. Modern processors contain billions, yet every one of them traces its lineage to that oscillating sine wave in a Dallas laboratory.

Norman Borlaug died at 95, having saved more lives than any other person in history through his development of high-yield, disease-resistant wheat strains that averted mass famine across Asia and Latin America. His Green Revolution fed over a billion people who would have otherwise starved, earning him the Nobel Peace Prize and the unofficial title "Father of the Green Revolution." Borlaug spent two decades in Mexico starting in 1944, working in fields under the hot sun to breed wheat varieties that produced dramatically higher yields while resisting the stem rust fungus that had devastated harvests for centuries. His semi-dwarf wheat, which put energy into grain rather than tall stalks, doubled and tripled yields across Mexico, then India and Pakistan. When India faced imminent famine in 1965, Borlaug personally supervised the planting of his new varieties, overcoming government bureaucracy, a war between India and Pakistan that held up seed shipments at the port of Bombay, and farmers' skepticism about foreign seeds. The results were immediate and extraordinary: India went from importing millions of tons of grain to self-sufficiency within five years. Pakistan followed the same trajectory. Borlaug received the Nobel Peace Prize in 1970, one of only a handful of scientists to receive the honor. Critics argued that the Green Revolution favored large landowners, increased dependence on chemical fertilizers, and reduced crop diversity. Borlaug acknowledged these concerns but maintained that the alternative was mass starvation on a scale the world had never seen. He continued working on African crop yields into his 90s, often lamenting that the continent had been left behind by the revolution he started.

The largest cavalry charge in recorded history thundered down the slopes of the Kahlenberg hills on the afternoon of September 12, 1683, as 20,000 horsemen, led by the winged hussars of Polish King Jan III Sobieski, slammed into the Ottoman lines besieging Vienna. Within three hours, the two-month siege was broken, and the Ottoman Empire’s last serious bid to conquer Central Europe ended in chaotic retreat along the Danube. Grand Vizier Kara Mustafa Pasha had arrived before Vienna’s walls in July with an army estimated at 150,000 men, intent on capturing the Habsburg capital and opening the road to Western Europe. Emperor Leopold I fled the city, leaving a garrison of roughly 15,000 under Count Ernst Rudiger von Starhemberg to hold out until relief could arrive. For sixty days, Ottoman sappers dug tunnels and detonated mines beneath the fortifications while the garrison fought a desperate underground war to counter them. By early September, sections of the outer walls had collapsed and the defenders were running low on food and ammunition. The relief force assembled through a rare alliance of convenience. Sobieski marched south from Poland, joining with Austrian, Saxon, Bavarian, and other German contingents to form an army of approximately 75,000. On September 12, they attacked from the wooded heights above the city. Infantry engaged the Ottoman positions through the morning, while Sobieski held his cavalry for a decisive afternoon charge. When the Polish hussars descended the hillside with their signature feathered wings rattling behind them, the Ottoman camp dissolved into panic. The defeat transformed the geopolitical balance of southeastern Europe. Within sixteen years, the Habsburgs had driven the Ottomans out of Hungary entirely through the Great Turkish War. Kara Mustafa was executed by strangulation with a silk cord on the sultan’s orders for his failure. Vienna never faced an Ottoman siege again, and the battle entered European mythology as the moment Christendom turned back the Turkish tide.

British soldiers advancing on Baltimore through the narrow neck of land between the Patapsco River and Bear Creek ran into something unexpected on September 12, 1814: an American force that held its ground, killed a general, and bought the crucial hours that saved the city. The Battle of North Point was a smaller engagement than the more famous bombardment of Fort McHenry that followed, but without it, Baltimore might have fallen as Washington had fallen three weeks earlier. After burning the American capital on August 24, British forces under Major General Robert Ross and Vice Admiral Alexander Cochrane turned their attention to Baltimore, the third-largest city in the United States and a nest of privateers who had been raiding British commerce. The plan called for a coordinated assault: Ross would lead 4,700 troops up the peninsula from the east while the Royal Navy bombarded Fort McHenry to open the harbor from the south. The Americans, led by Brigadier General John Stricker, positioned 3,200 militia along a defensive line near the Methodist Meeting House. They sent sharpshooters forward as a skirmish screen, and one of them, likely either Daniel Wells or Henry McComas, fired the shot that struck Ross from his horse. The general, a veteran of the Peninsular War and the man who had personally directed the burning of Washington, died within hours. His death demoralized the British column, which pressed the attack but with diminished aggression. Stricker’s militia eventually withdrew in orderly fashion after inflicting significant casualties, falling back to prepared fortifications at Hampstead Hill where 15,000 defenders waited behind earthworks and artillery. The British probed the defenses, concluded that a frontal assault would be suicidal, and waited for news from the naval bombardment. When Fort McHenry refused to fall after twenty-five hours of shelling, the British re-embarked and sailed away. Francis Scott Key, watching the bombardment from a truce ship, wrote the poem that became the national anthem. Baltimore’s survival was a turning point in the War of 1812.

Fifteen tons of California gold sat in the hold of the SS Central America when a Category 2 hurricane drove the aging sidewheel steamer beneath the Atlantic swells on September 12, 1857. The sinking killed 425 of the 578 people aboard and sent an estimated $2 million in gold coin and bullion to the ocean floor, roughly 160 miles east of Cape Hatteras, North Carolina. The financial shock that followed helped trigger the Panic of 1857, one of the worst economic crises of the nineteenth century. The Central America operated the crucial final leg of the Panama Route, the fastest path between California’s goldfields and the banking houses of New York. Prospectors and merchants shipped their fortunes east aboard her, and banks relied on regular gold shipments to maintain reserves. When the vessel departed Havana on September 8, she carried both commercial gold and the personal savings of hundreds of returning miners. The hurricane struck on September 9, battering the ship for three days. Water poured through leaking seams faster than the pumps and bucket brigades could clear it. Captain William Lewis Herndon, a decorated naval officer, organized the passengers into shifts and managed to transfer most of the women and children to a passing brig during a lull in the storm. When the boilers finally flooded and the engines died, Herndon reportedly stood on the paddle-wheel box in full uniform as the ship went down, going to his death with the calm expected of a nineteenth-century naval commander. The loss of so much gold in transit drained Eastern banks of the reserves they needed to back their notes. Banks suspended specie payments, credit markets seized, and the resulting panic rippled through the American and European economies. The wreck remained lost until 1988, when engineer Tommy Thompson located it using pioneering deep-sea robotic technology and recovered gold bars and coins worth hundreds of millions of dollars. The subsequent legal battles over ownership lasted longer than the salvage itself.

Leo Szilard was waiting for a traffic light to change at the corner of Southampton Row and Russell Square in London’s Bloomsbury district when the idea struck him. On September 12, 1933, the Hungarian physicist conceived of the nuclear chain reaction, the theoretical mechanism that would make both nuclear power and nuclear weapons possible. The light turned green, he crossed the street, and the atomic age began as a thought experiment on a London sidewalk. Szilard had been provoked by a newspaper account of a speech given the previous day by Ernest Rutherford, the towering figure of nuclear physics, who had publicly dismissed the possibility of extracting useful energy from atomic nuclei as "moonshine." Szilard, a former student of Einstein with an instinct for contrarian thinking, immediately began working through the problem. If a neutron could split an atom and that fission released additional neutrons, those neutrons could split more atoms, creating a self-sustaining cascade of energy release. The concept was purely theoretical in 1933. No one had yet identified an element that would sustain such a reaction. Szilard filed a patent on the chain reaction idea in 1934 and, remarkably, assigned it to the British Admiralty in secret, recognizing even then the military implications. He spent the next several years searching for suitable elements, testing beryllium and indium without success. The breakthrough came in January 1939, when Otto Hahn and Fritz Strassmann in Berlin demonstrated that uranium atoms could be split by neutron bombardment. Szilard immediately grasped the danger. He drafted the letter that Einstein signed and sent to President Roosevelt in August 1939, warning that Germany might develop an atomic bomb and urging the United States to begin its own research. That letter led to the Manhattan Project. Szilard worked at the University of Chicago, where Enrico Fermi achieved the first controlled chain reaction in December 1942. The man who conceived the idea at a traffic light spent the rest of his life campaigning against the weapon it produced.