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25 April 1846, at Rancho de Carricitos

On 25 April 1846, Captain Seth Thornton led 63 U.S. dragoons toward Rancho de Carricitos, about 28 miles upriver from Fort Texas, to investigate reports that a large Mexican force had crossed the Rio Grande.

Mexican general Anastasio Torrejón was moving nearly 1,600 cavalry and infantry toward the same ranch. He surrounded Thornton's men inside a field enclosed by dense chaparral.

Trapped inside the field

Gunfire stopped the dragoons' attempted charge, and Mexican troops blocked escape through the brush. The survivors surrendered.

The National Park Service account gives 11 U.S. dead and 46 prisoners, Thornton among them; casualty totals differ between official and later accounts.

Word reached Fort Texas later the same day, and General Zachary Taylor forwarded the news that hostilities had commenced.

Whose soil it was

The site lay north of the Rio Grande but inside the disputed Nueces–Rio Grande strip, where sovereignty was unresolved. Polk's later assertion that American blood had been shed on American soil was therefore a contested political claim.

Congress had not declared war, and Palo Alto and Resaca de la Palma would be fought on 8 and 9 May before it did.

The exact spot is now lost: the Rio Grande has repeatedly shifted its channel, and the nineteenth-century distances followed a winding route.

13 May 1846: signed, then proclaimed

On 13 May 1846, President James K. Polk approved "An Act providing for the Prosecution of the existing War between the United States and the Republic of Mexico," making the congressional measure law.

He issued a proclamation the same day announcing the state of war and directing civil and military officeholders to discharge their wartime duties zealously. His secretary of state, James Buchanan, countersigned it.

Troops, money, and a finding of blame

The statute did more than declare. It authorized as many as 50,000 volunteers — serving twelve months from arrival at rendezvous, or until the war ended, unless sooner discharged — and appropriated $10 million.

Its wording held that a state of war existed because of an act of Mexico, and authorized Polk to employ the militia, naval and military forces. That assignment of blame was disputed, because the first clash had occurred in territory both countries claimed.

Three dates, and a war already running

"The United States declared war on 13 May" compresses three separate acts: the House voted 174–14 on 11 May, the Senate 40–2 on 12 May, and Polk signed on the 13th. John C. Calhoun abstained after failing to limit or slow the measure.

The shooting had begun well before any of that. The Thornton Affair was on 25 April, and Palo Alto and Resaca de la Palma were fought on 8 and 9 May, before the act became law.

19 May 1848, at Querétaro

On 19 May 1848, meeting at Querétaro while U.S. forces occupied Mexico City, Mexico's Chamber of Deputies approved the Treaty of Guadalupe Hidalgo as amended by the United States. The vote was 51 in favour and 35 against, after an intense debate over accepting the territorial settlement or continuing the war.

The U.S. Senate had sent the February treaty back with amendments, deleting Article X and modifying other provisions. Mexico's government — defeated, financially exhausted and displaced from its capital — put that amended text to Congress as the alternative to renewed fighting.

Not ratification, not yet

The deputies' vote did not finish the process. The Mexican Senate still had to approve their resolution, and did so several days later, 33 to 4.

On the same 19 May, Foreign Minister Luis de la Rosa moved preparations along by asking the U.S. commissioners, Nathan Clifford and Ambrose Sevier, to come to Querétaro.

Presidential ratification and the exchange of ratifications at Querétaro on 30 May still lay ahead.

What the deputies were accepting

The treaty promised Mexico US$15 million, and the United States assumed up to US$3.25 million in specified claims held by U.S. citizens against the Mexican government. More than 525,000 square miles were added to the United States.

Article VIII let residents who stayed in the transferred territories formally elect to retain Mexican nationality; moving away was not the only way to remain Mexican.

The original treaty had been signed at Guadalupe Hidalgo on 2 February by Nicholas Trist, who negotiated and signed it after President Polk had recalled him. What the deputies were voting on was not that text but the version the U.S. Senate had since amended, with Article X struck out.

1850: a landmark paper in two halves

In 1850, Rudolf Clausius published "Ueber die bewegende Kraft der Wärme und die Gesetze, welche sich daraus für die Wärmelehre selbst ableiten lassen" in Annalen der Physik und Chemie.

It ran in two installments: pages 368 to 397, then resuming more than a hundred journal pages later at 500 and running to 524.

The contradiction he was there to fix

Sadi Carnot's theorem about ideal heat-engine efficiency worked, but Carnot had derived it while treating heat as a conserved, indestructible fluid. James Prescott Joule's experiments had since shown a quantitative equivalence between heat and mechanical work.

Clausius kept the engine result and threw out the caloric assumption used to justify it, incorporating energy conservation into a modern theory of heat.

A sentence that sounds ordinary

The paper introduced the principle that heat cannot of itself pass from a colder body to a hotter one — a foundational formulation of what became the second law of thermodynamics.

The word "entropy" appears nowhere in it. Clausius developed the transformation theory further in 1854 and coined that term only in 1865.

The English paper usually cited as "On the Moving Force of Heat" came out in Philosophical Magazine in 1851, and is sometimes mistaken for the 1850 original.

Jintian village, 11 January 1851

On the conventionally accepted date of 11 January 1851, more than 10,000 members of the God Worshipping Society assembled at Jintian Village in Guiping County, Guangxi, and raised the standard of revolt against Qing rule.

The assembly called itself the Taiping Army and declared an intention to overthrow the Qing government. Some accounts have Hong Xiuquan assuming the titles "King of Peace" and "Heavenly King" that day; a detailed chronology of the uprising treats 11 January as the proclamation of the uprising and the Taiping Heavenly Kingdom, and places Hong's explicit Heavenly King declaration later, at East Village.

The more than 10,000 assembled adherents formed a religious community, not simply a 10,000-man army.

A marker inside a longer mobilisation

January 11 functioned as a formal and commemorative marker. Hong had issued military rules by early November 1850, and fighting with Qing forces had already occurred before the proclamation.

Those early regulations segregated men and women, banned pillaging and desertion, and demanded obedience to drum and bugle signals. Feng Yunshan helped build the society in Guangxi and devised early rules and organisational practices.

The proclamation did not create the mature territorial state later headquartered at Nanjing; substantive regime-building followed the capture of Yong'an in September 1851.

Which day, if any

Even the lunar reading is contested. One chronology puts 11 January at the tenth day of the twelfth lunar month in the thirtieth Daoguang year; another makes it the eleventh day of the first lunar month of 1851, and some secondary references give 1 January instead.

Luo Ergang argued for 11 January 1851; other historians proposed 5 April or 4 November 1850, and Wang Qingcheng treated the uprising as a months-long process rather than a single-day event.

Accounts also differ over when Hong's kingship and the Taiping state became formally constituted, some distinguishing the Jintian proclamation from the later regime establishment at Yong'an.

August 1856, the Kleine Feldhofer Grotte

In August 1856, quarry workers clearing clay from the Kleine Feldhofer Grotte in Prussia's Neander Valley recovered a skullcap and 15 postcranial bones of a human skeleton, from a deposit reported at about two feet down.

Some pieces were noticed only after the clay had been thrown out of the cave and had fallen roughly 20 metres to the valley floor. The quarry proprietor, Wilhelm Beckershoff, told the workers to watch for more.

Fuhlrott arrives near the end of August

At Friedrich Wilhelm Pieper's invitation, the teacher and naturalist Johann Carl Fuhlrott visited near the end of August, identified the remains as human, and wrote down what the workers remembered of the discovery.

Sixteen pieces survived the clearing. Smaller bones had been ignored or discarded, no controlled geological or archaeological record was made, and the narrative had to be reconstructed from recollections perhaps two weeks old.

What August 1856 did not settle

The name Homo neanderthalensis was not applied then; William King proposed it in the 1860s. The anatomist Hermann Schaaffhausen saw the bones only after Fuhlrott brought them to Bonn that winter.

Earlier Neanderthal remains had already been found at Engis and Gibraltar without their significance being recognized. This specimen became the first recognized and debated as an ancient human form.

Its age could not be established from its setting: the cave held no associated datable finds, and quarrying destroyed it.

1 September 1859: a white spot on the Sun

Richard Carrington, working from his private observatory at Redhill in England, and Richard Hodgson, observing independently, both saw a short-lived white-light brightening over a sunspot group on 1 September 1859. It was the first recorded visual observation of a solar flare.

Carrington left his instrument to fetch another witness; roughly sixty seconds later the patches had already changed.

About 17 hours later

An associated solar disturbance reached Earth on 2 September and produced an extraordinary geomagnetic storm.

Auroras appeared at unusually low latitudes. Well-dated reports include Panama, Cuba, Mexico, Hawaii and locations in South America; the Royal Astronomical Society summarises the reach as far south as the Caribbean.

Magnetographs at Greenwich and Kew were driven off scale, and geomagnetically induced currents disrupted telegraph systems across Europe and North America — equipment sparked or caught fire, and some operators received shocks.

What the record will and will not support

The 28 August date attached to this entry belongs to a distinct precursor storm in the same active sequence, not to the Carrington flare and storm of 1–2 September.

Calling the storm unequivocally the largest ever recorded is not secure. Modern reconstructions put its maximum disturbance at a median −Dst of 964 nT, with a 68% credibility interval of 855–1,087 nT, and place it among the strongest observed; the 1872 and 1921 storms may have been comparable.

Carrington himself cautioned against hastily claiming a causal connection from a single coincidence; the solar–terrestrial interpretation was developed afterward, with Balfour Stewart's analysis of the Kew record published later.

A roadside meeting in northern Campania, October 1860

Garibaldi and Victor Emmanuel II met in northern Campania on 26 October 1860, as Garibaldi advanced after his victory at the Volturno and the king approached through the Abruzzi with the Piedmontese army.

Garibaldi saluted Victor Emmanuel as King of Italy, publicly accepting the Savoy monarchy's leadership of the unification project even though that title had not yet been established by law.

A near-contemporary account relayed by Major Cattabene says the two men remained hand in hand, silent and visibly moved, for nearly a minute.

What the handshake did and did not transfer

The encounter marked a transfer of political and military initiative in southern Italy from Garibaldi's provisional authorities to the royal government and army. It was not itself a deed conveying Naples to the king.

Garibaldi's dictatorial government continued in practice until Victor Emmanuel entered Naples on 7 November.

Francis II's remaining forces still held Gaeta and other fortresses, so the Bourbon war had not ended either.

Which day, and which patch of road

Treccani's Dictionary of History, contemporary-derived narratives and official commemorations give 26 October; a 2020 Treccani biographical entry instead dates the brief meeting to 25 October.

The exact spot is contested as well — sources variously place it near Teano, at the Caianello/San Nicola bridge, or around Taverna della Catena near modern Vairano Scalo.

The familiar handshake and dialogue derive from narrated eyewitness traditions and later representations, so the choreography should not be inferred from commemorative paintings or sculpture.

10 a.m., 4 July 1863

Confederate commander John C. Pemberton formally surrendered his Vicksburg garrison on 4 July 1863, having asked for negotiations the previous day and accepted Grant's amended terms overnight.

At 10 a.m. the Confederate troops marched out of their entrenchments, stacked their weapons, removed their accoutrements and furled their flags. Grant's Army of the Tennessee then entered and occupied Vicksburg, Mississippi.

Parole instead of unconditional surrender

Grant is strongly associated with the phrase “unconditional surrender.” At Vicksburg he did not impose it.

He paroled the defenders, allowing them to leave after promising not to fight again until formally exchanged. The surrender covered 29,396 Confederate officers and enlisted men, all granted parole.

The river was not open yet

What capitulated was not only a city. Pemberton gave up an entire Confederate field army and garrison after weeks of encirclement, bombardment and supply shortage, with no effective relief arriving; his council of war on 3 July preceded the request for terms.

Vicksburg's fall did not by itself give the Union unobstructed use of the Mississippi. Port Hudson remained Confederate until it surrendered on 9 July, five days later.

The procession from the Wills house

Dignitaries gathered outside David Wills's Gettysburg home by 10 a.m. on 19 November 1863 and processed to the new Soldiers' National Cemetery for its dedication. Lincoln wore white gauntlets and mourning crepe on his hat for his dead son Willie.

Edward Everett, the principal orator, delivered the ceremony's planned historical oration for more than two hours. After a funeral dirge, Lincoln rose to give the shorter presidential remarks Wills had requested.

About two minutes

Lincoln spoke for roughly two minutes — one National Park Service account estimates three. He invoked the Declaration of Independence's principles of liberty and equality, honored the dead, and charged the living to complete their “unfinished work” and secure a “new birth of freedom.”

The familiar story of a baffled, silent crowd does not survive the transcriptions. Newspaper accounts recorded several bursts of applause, including prolonged applause at the end.

A cemetery still filling

The cemetery, laid out by William Saunders on 17 acres initially purchased, was officially dedicated that day — while workers were still moving Union bodies out of temporary battlefield graves.

Lincoln attended another address that afternoon and left Gettysburg by special train at about 7 p.m. Newspapers printed his words almost immediately and reactions divided largely along partisan lines; Everett sent Lincoln a strongly complimentary letter the next day.

The last day of a two-week conference

The Convention for the Amelioration of the Condition of the Wounded in Armies in the Field was adopted on 22 August 1864, the closing day of a diplomatic conference that had sat in Geneva since 8 August.

Sixteen states were represented and twelve signed: Baden, Belgium, Denmark, France, Hesse, Italy, the Netherlands, Portugal, Prussia, Spain, Switzerland and Württemberg. Guillaume-Henri Dufour, who presided over the conference, signed for Switzerland.

Ten articles and a red cross

The treaty ran to ten articles. It required wounded and sick troops to be collected and cared for without distinction of nationality, and gave conditional neutrality to military hospitals, ambulances and their personnel.

It also adopted a red cross on a white ground as the uniform protective sign for medical facilities, evacuation parties and qualifying personnel — an emblem specified by treaty, not merely the badge of a newly named organization.

Signed, not yet in force

The text was left open for other governments to accede, and ratifications were to be exchanged at Bern. The convention entered into force on 22 June 1865, ten months after the signing.

Its subject was narrow: wounded and sick members of armies in the field and their medical services. It did not create general legal protection for civilians, prisoners of war or naval casualties — that is the later, comprehensive four-convention system of 1949.

A wartime election night

Voters in the participating United States chose presidential electors on 8 November 1864, picking the National Union ticket of Abraham Lincoln and Andrew Johnson over the Democrats George B. McClellan and George H. Pendleton. Eleven states in rebellion did not appear in the tabulation used for the national result.

At 7 p.m., in heavy rain, Lincoln went to the War Department telegraph office to take the returns. By midnight enough had arrived for the men in the office to congratulate him, although the storm had delayed reports from his own Illinois.

Lopsided in electors, narrower in votes

The final tabulation gave Lincoln 212 electoral votes to McClellan's 21. The popular vote was closer: 2,220,846 to 1,809,445, or 55.1 against 44.9 percent.

That is a margin of 411,401 votes and 10.2 points — decisive rather than near-unanimous. Congress later excluded electoral votes claimed from Union-controlled Louisiana and Tennessee, so 212–21 is the accepted count, not a tally of every ballot cast in reconstructed areas.

Ballots from the field

Nineteen states had passed legislation letting soldiers vote in the field, by mail or on leave — the first American war with broad arrangements for deployed soldiers to vote. About 150,000 field ballots were cast, roughly 78 percent of them for Lincoln.

Whether they decided the race is a separate claim: field ballots were under six percent of all ballots cast, and their precise electoral effect remains debated. McClellan, a general running on a platform that called the war a failure, had publicly repudiated that peace plank.