Terra Tempus Daily #142 · October 20, 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

Battle of Dorylaeum

1097 · Medieval

Why there: Dorylaeum sat on the main overland road across the arid Anatolian plateau, the only viable route the crusaders could take toward Syria, and thus the natural place for the Seljuk Turks who controlled that interior to intercept them.

Why then: The First Crusade came in 1097 because Pope Urban II's 1095 call mobilized Western knights just as the Seljuks' recent seizure of Anatolia and a fracturing Byzantine frontier drew the armies eastward through Turkish-held land.

• This First Crusade victory was over the Seljuk Turks under Kilij Arslan.
• The crusader vanguard under Bohemond of Taranto dismounted and held out until reinforcements arrived to break the Turkish encirclement.
• It was fought near a town in western Anatolia, close to a modern Turkish city.

Round 3

Gadsden Purchase

1853 · 19th Century

Why there: The flat, low-elevation desert south of the Gila River offered the only practical grade for a transcontinental railroad avoiding the Rockies, and it still lay in Mexican hands after the 1848 border was drawn just north of it.

Why then: Coming right after the Mexican-American War and amid the railroad boom, the U.S. was flush with expansionist ambition and eager to build a southern rail line, while a cash-strapped postwar Mexico was willing to sell for ten million dollars.

• The Gadsden Purchase (1853) transferred land from Mexico to the United States for $10 million.
• It secured territory for a planned southern transcontinental railroad route.
• It established most of the present-day border of Arizona and New Mexico with Mexico.

Round 4

Battle of Preveza

1538 · Early Modern

Why there: Preveza guards the mouth of the Ambracian Gulf on Greece's western coast, a chokepoint controlling the sea lanes between the Ottoman Balkans and the Adriatic approaches to Venice and Italy, making it the natural clash point for rival Mediterranean fleets.

Why then: By the 1530s the Ottomans under Suleiman had absorbed the corsair fleets of Barbarossa into imperial service, and Charles V's Habsburg-Venetian-Papal Holy League formed specifically to contest this new Ottoman naval reach, so the galley-warfare showdown could only come once both sea powers had consolidated.

• This 1538 naval clash was an Ottoman victory under the admiral Hayreddin Barbarossa.
• Barbarossa defeated a Holy League fleet whose nominal commander was the Genoese admiral Andrea Doria.
• The Holy League's larger fleet was crippled when calm winds becalmed its ships, securing Ottoman naval dominance for decades.

Round 5

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.