Terra Tempus Daily #118 — September 26, 2026

Round 1

Withheld from the archive

This round was played, but we do not republish it here. Recent events involving mass civilian casualties are excluded from our public archive under our content policy, whatever their place in the day’s puzzle.

Round 2

1960 Valdivia earthquake

1960 Valdivia earthquake · 1960 · 20th Century

Why there: Southern Chile sits atop the Peru-Chile Trench, where the oceanic Nazca Plate dives beneath the South American Plate, storing immense strain along one of Earth's most active subduction zones and producing the megathrust rupture near Valdivia.

Why then: By 1960 a global network of seismographs and coordinated observatories could finally measure quakes on a common magnitude scale, letting scientists document this rupture as the strongest ever instrumentally recorded and trace its Pacific-wide tsunami.

• The 1960 Valdivia earthquake in Chile is the strongest ever recorded, about magnitude 9.5.
• Tsunamis crossed the Pacific, killing people in Hawaii, Japan, and the Philippines.
• The Cordón Caulle volcano erupted about 38 hours after the main shock.

Round 3

Battle of Nedao

Battle of Nedao · 454 · Antiquity

Why there: The Pannonian plain along the Nedao river was the grassy heartland where the Hunnic empire had settled its horse herds and subject Germanic peoples, so the revolt naturally erupted on the very lowlands the Huns used as their base of power.

Why then: The death of Attila in 453 removed the singular leader who held the confederation together, and with his sons splitting the subject tribes among themselves like property, the resentful Gepids and other vassals seized that succession crisis as the moment to break free.

• The Battle of Nedao (454 CE) followed the death of Attila the Hun the previous year.
• A coalition led by the Gepid king Ardaric defeated Attila's sons, ending Hunnic dominance in Central Europe.
• It was fought in Pannonia, in the region of modern Serbia.

Round 4

Battle of Grunwald

Battle of Grunwald · 1410 · Medieval

Why there: The battle unfolded on the Teutonic Order's frontier in Prussia, where the knights' expansion collided with Polish and Lithuanian lands, making this borderland between the villages of Grunwald and Tannenberg the natural clash point.

Why then: The 1386 dynastic union of Poland and Lithuania under Jagiełło, sealed by Lithuania's conversion to Christianity, stripped the Order of its crusading pretext and united two former enemies powerful enough to finally confront it.

• The Battle of Grunwald (1410) crushed the Teutonic Knights under Grand Master Ulrich von Jungingen.
• It was one of the largest battles of medieval Europe, fought during the Polish-Lithuanian-Teutonic War.
• The defeat marked the beginning of the decline of the Teutonic Order's power in the Baltic.

Round 5

Wounded Knee Massacre

Wounded Knee Massacre · 1890 · 19th Century

Why there: The creek lay within the Pine Ridge Reservation in South Dakota, where Lakota bands had been confined onto shrinking government-controlled land after being pushed off their traditional plains hunting grounds.

Why then: By 1890 the frontier was nearly closed, the bison exterminated, and desperate reservation communities embraced the Ghost Dance revival, which alarmed the U.S. Army into a disarmament campaign that turned deadly.

• The Wounded Knee Massacre occurred in December 1890 in South Dakota.
• Around 250-300 Lakota, including many women and children, were killed by the U.S. 7th Cavalry.
• It followed the rise of the Ghost Dance movement and the killing of Sitting Bull.