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10 April 1815, on the Sanggar Peninsula

At about 7 p.m. local time on 10 April 1815, three eruption columns rose from Mount Tambora, on Sumbawa, and merged overhead. An account collected by Stamford Raffles says falling material had obscured the spectacle in darkness by about 8 p.m.

This was a climax, not a beginning. Major explosions had started on 5 April, and the climactic activity ran on into 11 April rather than stopping at midnight.

Flows to the sea, then a hole where the summit had been

The climactic phase sent pyroclastic flows to the sea around the Sanggar Peninsula, devastating nearby settlements and cropland and generating a tsunami.

Roughly 50 cubic kilometres of magma — about 140 gigatonnes, dense-rock equivalent — was expelled, with short-lived Plinian plumes reaching as high as 43 km. Emptying the chamber collapsed the summit, leaving the caldera visible today, about 6 km wide and 1,250 m deep.

Sulfur, and the counting of the dead

About 60 megatonnes of sulfur went into the stratosphere. Death tolls differ sharply between sources because they combine deaths during the eruption with famine and disease over the following months and years; the best-supported broad statement is more than 71,000 deaths on Sumbawa and Lombok during or after the eruption.

The region was then under the British interregnum in the former Dutch possessions. Lieutenant Owen Phillips travelled to Sumbawa with rice and gathered the local testimony — including the Rajah of Sanggar's account — that Raffles published.

Dawn in the Basque Roads, 15 July 1815

At dawn on 15 July 1815, the French brig Épervier came up to HMS Bellerophon in the Basque Roads off Rochefort under a flag of truce. Wind and tide stopped her about a mile short.

Captain Frederick Lewis Maitland sent the 74-gun ship's barge across for the last mile. It returned shortly after 6 a.m., carrying Napoleon.

"Under the protection of British law"

Napoleon came up the side in the uniform of the Imperial Guard's Chasseurs à Cheval, announced by his grand marshal Henri-Gatien Bertrand. He told Maitland that he was placing himself under the protection of the British prince and of British law.

Maitland had warned Napoleon's representatives repeatedly that he could promise no terms and no asylum; Emmanuel de Las Cases had acknowledged as much in talks the day before.

Maitland accepted him for transport to England and placed him at the disposal of the Prince Regent.

What was not settled that morning

Napoleon had meant to sail for the United States. British cruisers off Rochefort had closed that route, and Maitland would let no vessel carrying him pass, so he came aboard instead — with a principal suite of 33.

Napoleon was not told that morning that he would be sent to Saint Helena. Britain informed him of that decision on 31 July.

"Surrender" is the conventional British and museum description of the day; Napoleon presented himself as a voluntary guest seeking asylum, and Maitland took him aboard without granting any terms.

3 June 1818, near Asirgarh

After prolonged negotiations, Peshwa Baji Rao II surrendered on 3 June 1818 to Sir John Malcolm, an East India Company general and political officer, near Dholkot, close to Asirgarh.

It was a negotiated submission rather than a battlefield capture. Roughly 8,000 men were still with him, but Company forces had blocked his routes north and were closing in from several directions, and he was in country he did not know.

The terms Malcolm offered

Malcolm promised an annual maintenance of at least eight lakh rupees — 800,000 a year. In return Baji Rao gave up his sovereignty as peshwa and accepted removal from the Deccan.

Malcolm sent his political assistants John Low and John Macdonald to negotiate those points. The British had also demanded Trimbakji Dengle, the minister blamed for Gangadhar Shastri's murder; Baji Rao did not deliver him, and he was captured separately later in June.

Bithur, and what the surrender did not do

The governor-general ratified Malcolm's terms. Bithur, near Kanpur, was chosen as Baji Rao's residence, and he was conducted there under Company supervision.

The office of peshwa was extinguished, but every Maratha territory was not swept up at once: Satara, Nagpur, Indore and Gwalior each followed a different political settlement.

The terms were controversial among British officials at the time, who held that the defeated peshwa had been in no position to bargain at all.

21 April 1820: a lecture demonstration in Copenhagen

During a University of Copenhagen lecture demonstration on 21 April 1820, Hans Christian Ørsted connected a wire across a galvanic battery and saw a nearby compass needle deflect from magnetic north. The movement was slight — reportedly too slight for the audience to notice.

The difference was simply whether the circuit was open or closed: only the completed circuit moved the needle. Ørsted read that as evidence that a closed electric circuit could act on a magnet.

Three months before he published

He did not announce anything that day. He reconsidered the observation and then ran stronger, more systematic experiments in July, with Johan Georg Forchhammer Esmark helping repeat and extend the work on a more powerful galvanic apparatus.

The published experiment used 20 copper troughs. With that apparatus the needle could turn about 45 degrees when the wire was no more than three-quarters of an inch from it.

Ørsted issued the result on 21 July 1820 as a short Latin pamphlet, sent directly to scientists and learned societies.

How firm the April date is

The American Physical Society supports 21 April for the first observation. Ørsted's own 1820 account says only that his first experiments fell during the preceding winter's lectures, and University of Copenhagen material places the demonstration more generally in spring 1820.

How accidental it was is also disputed. The safest statement is that the needle's particular motion was unexpected, though Ørsted had long been looking for a connection between natural forces.

Nothing was publicly transformed on 21 April: the July pamphlet, not the April lecture, put the result in front of European science.

9 December 1824 on the Pampa de Quinua

On 9 December 1824, Antonio José de Sucre's United Liberation Army of Peru faced Viceroy José de la Serna's larger royalist army on the Pampa de Quinua near Ayacucho. Sucre's later official report put the two forces at 5,780 and 9,310.

Later accounts report that shortly before the fighting, officers divided by friendship and family ties met unarmed between the lines, embraced, and then went back to their armies.

Downhill, and piecemeal

The royalist attack came off the Condorcunca heights in separated formations across broken ground, so the divisions could not all form up effectively on the plain.

Sucre reinforced José de La Mar's pressured left while José María Córdova's division and William Miller's cavalry counterattacked before much of the royalist force had deployed. The royalist army broke, La Serna was wounded and captured, and José de Canterac assumed command of the defeated force.

Sucre's report of 11 December gave 370 patriots killed and 600 wounded, against 1,800 royalist dead, 700 wounded and more than 2,000 rank-and-file prisoners.

A capitulation signed on the field

With the viceroy wounded and a prisoner, Canterac negotiated and signed the Capitulation of Ayacucho with Sucre that same day. It surrendered the territory, garrisons, stores and posts under royalist command, granted passage to Spain, and protected officers and residents who submitted to the new order.

It did not clear every holdout. Callao was to be handed over and its commander refused; royalists held Callao and Chiloé until 1826, and fighting continued in Upper Peru through 1825.

Word of the outcome left within hours of the battle and travelled overland; Lima did not have it until 22 December, nearly thirteen days later.

28 August 1833: royal assent, and nobody freed

The Slavery Abolition Act 1833, 3 & 4 William IV c. 73, received royal assent on 28 August 1833. No one was freed that day.

The act scheduled abolition for 1 August 1834, and even then converted most enslaved people aged six or over into compulsory "apprenticed labourers" rather than granting immediate, unconditional freedom. Children under six were freed under the scheme.

£20 million, and who was to receive it

Parliament authorized up to £20 million in compensation for people legally entitled to enslaved labour. The formerly enslaved received no monetary compensation.

The money itself came later, raised as a £15 million public loan plus £5 million in government stock and administered by the Slave Compensation Commission chiefly from 1835 onward.

Not the whole empire, and not the whole story

The statute expressly excluded territories controlled by the East India Company, along with Ceylon and St Helena, so "abolition throughout the British Empire" is inaccurate shorthand for what this act did.

Compulsory apprenticeship ran until 1838. More than 800,000 people are estimated to have been emancipated across the wider process the act set in motion.

2 October 1836: Falmouth, after heavy weather

HMS Beagle reached England on 2 October 1836 and anchored at Falmouth, Cornwall, after heavy weather. Charles Darwin went ashore and set off for Shrewsbury by mail coach the same night.

His first sight of England moved him remarkably little. In his diary he compared it unfavourably with an ordinary Portuguese settlement.

The collection was not in his luggage

Darwin did not carry the voyage's collection ashore with him. Much of it had gone to England during the voyage, dispatched through his Cambridge mentor John Stevens Henslow — 1,529 species preserved in spirit and 3,907 labelled skins, bones and other dried specimens.

He had sailed as an independent gentleman-naturalist rather than a salaried Admiralty naturalist, so the collections were his own property.

The ship's work was not finished either: Beagle went on to Plymouth on 4 October and later to Greenwich, where Darwin returned to unload what was still aboard.

What had not happened yet

Robert FitzRoy stayed with the ship. At the voyage's end her time in commission was recorded as five years and 136 days.

Darwin had not yet begun his systematic work on species transmutation. He opened his species notebooks in 1837 and reached the natural-selection mechanism in 1838 after reading Thomas Malthus.

His own account of the voyage did not appear in print until 1839.

24 May 1844: Capitol to Baltimore

On 24 May 1844, Samuel F. B. Morse transmitted "What hath God wrought?" from the U.S. Capitol in Washington to Alfred Vail at a Baltimore & Ohio Railroad depot in Baltimore. It formally opened the experimental line Congress had financed with $30,000.

Annie G. Ellsworth, daughter of patent commissioner Henry L. Ellsworth, had selected the wording from Numbers 23:23. The surviving outgoing tape credits her suggestion and carries Morse's handwritten authentication.

The demonstration was a round trip

Vail received the message and immediately transmitted the same words back to Washington, demonstrating two-way operation of the completed line.

Institutional accounts measure that line at 38 or 40 miles. The Library of Congress holds the outgoing 24 May tape; a similar Smithsonian strip is a Baltimore-to-Washington souvenir made on 25 May.

Not the first electrical telegram

Cooke and Wheatstone had demonstrated a practical electric telegraph in Britain in 1837, and Morse, Vail and their collaborators had shown versions of their own apparatus before 1844.

The defensible description of 24 May is narrower: the first formal public message over Morse's completed Washington–Baltimore line.

Where in the Capitol he sent it from is less certain than what he sent. The Library of Congress identifies the room as the former Supreme Court chamber; the Senate Historical Office notes that identification rests on accounts written decades later.

A September of newspaper dates

Cormac Ó Gráda's scholarly history dates the first Irish press notice of Phytophthora infestans to 6 September 1845, not the 9 September filed against this entry. The Dublin Evening Post and the Waterford Freeman both reported the disease that day; the Waterford report said blight had seriously damaged potatoes in its immediate locality and left the affected tubers unfit for use.

No two chronologies agree on which notice came first. Paul Bew gives 9 September for the Dublin Evening Post report. The Freeman's Journal carried the disease — “cholera” in potatoes, it was called — on 11 September, especially in the north. On 13 September the Gardeners' Chronicle announced that the potato murrain had unequivocally declared itself in Ireland, and one standard chronology treats that as the first Irish newspaper report. Christine Kinealy dates it to 16 September.

Reporting, not arrival

The reports recorded disease already visible in Irish fields. The pathogen did not enter or infect the whole of Ireland on any publication day, and it spread unevenly between districts.

The spread of dates is a spread of definitions as much as of evidence. First outbreak, first observation and first newspaper report are three different milestones, and only the last leaves a printed trace. No defensible single day can be assigned to the pathogen's biological arrival.

What 1845 actually cost

Estimates put the share of Irish potato acreage infected in 1845 at between one-third and one-half, with Ó Gráda's own summary giving about one-third — a serious but partial and uneven loss, not the destruction of the whole harvest.

The London Gardeners' Chronicle halted its press to announce the Irish outbreak, but Ó Gráda found little immediate reaction in Dublin potato prices.

Calling one September date the day the Great Famine began is editorial shorthand for the first reports of its biological trigger — and the record cannot agree on which September date that was. Documented famine deaths began in 1846.

16 October 1846, in the surgical amphitheatre

In the Massachusetts General Hospital amphitheatre — later called the Ether Dome — the Boston dentist William T. G. Morton administered inhaled ether to Gilbert Abbott on 16 October 1846, before the surgeon John Collins Warren operated beneath Abbott's jaw.

Morton supplied the inhalation apparatus and gave the ether; Warren performed the surgery.

Warren had postponed the operation three days earlier, on 13 October, because he had promised Morton a chance to test his proposed method of preventing surgical pain.

What the operative record says

The record describes an incision exposing a mass of large veins and small arteries, with Warren passing a ligature beneath it. The procedure was an attempted ligation of a congenital lymphovascular malformation, not the complete removal of a neck tumour.

A retrospective addition to Abbott's records says he appeared asleep after four or five minutes and did not shrink or cry out, but later moved his limbs and made sounds that observers read as possible signs of pain.

How convincing it looked at the time

After recovering, Abbott consistently said he had felt no pain, describing only a sensation resembling scraping with a blunt instrument.

Ether was used again at the hospital the next day, and Henry Jacob Bigelow regarded that second trial as a complete success, whereas the 16 October result was initially considered only moderately successful or suggestive. Bigelow's detailed report was published on 18 November 1846.

Warren's celebrated "Gentlemen, this is no humbug" is not securely documented in the contemporaneous operative record, and Crawford Long had used ether privately in Georgia from 1842 without publishing until 1849.

Late February 1848, at 46 Liverpool Street

In late February 1848 a London printing office associated with the German Workers' Educational Society produced the first German edition of Manifest der kommunistischen Partei.

It was a 23-page pamphlet in a green paper wrapper, printed by J. E. Burghard at 46 Liverpool Street, Bishopsgate.

The first printing was in German. The first English translation waited until 1850, when Helen Macfarlane's version was serialised in The Red Republican.

A commissioned party programme

The pamphlet supplied the Communist League with the theoretical and practical party programme it had commissioned Marx and Engels to prepare at its London congress in late 1847.

Engels had produced earlier catechism-style drafts and then proposed turning the planned document into a historical manifesto; Marx prepared the final manuscript in Brussels.

The League obtained a compact printed programme for circulation among German-speaking activists, though its immediate readership was limited.

Why 21 February will not hold

The date is widely commemorated, but the first edition itself says only that it was published in February 1848, and scholarly and bibliographical accounts generally say "late February" or "the end of February."

The Workers' Educational Society agreed to cover the printing expenses on 29 February, and contemporary recollections have the pamphlet arriving with news of the Paris revolution — both reasons to hold to the month rather than the day.

The manuscript was already at the printer before the French outbreak, so the Manifesto did not set off the Revolutions of 1848.

A date with no outbreak attached

No securely documented single outbreak began on a known day in 1855. The conventional date marks a mid-nineteenth-century phase in which plague intensified and became endemic across parts of southwestern China.

Historical research places recognisable plague in Yunnan much earlier: local cases were recorded from the late eighteenth century, with one medical review citing Dali in 1772.

What was moving in Yunnan in the mid-1850s

Military conflict and the increased movement of troops, provisions and refugees in Yunnan during the mid-1850s likely amplified regional transmission.

The escalating Hui Muslim rebellion — later known as the Panthay Rebellion — contributed to that population movement, though its own starting date also varies by account.

There was no single verified ignition: long-standing plague foci interacted with Qing-era economic expansion, trade routes, environmental conditions and wartime movement to produce a sustained regional upsurge.

The global phase came in 1894

Plague did not become a worldwide pandemic in 1855. Its major global dissemination began after it reached Canton and Hong Kong in 1894, and it spread gradually through southern China over the intervening decades.

Carol Benedict traces the Yunnan epidemic to the late eighteenth century; other researchers describe an upsurge at the end of the 1850s or endemicity during the 1850s and 1860s. Some scientific studies date the third-pandemic lineage or transmission process to 1772, while historians reserve "pandemic" for the global phase from 1894.

Historical Yunnan sources used changing disease terms, so retrospective identification of individual early outbreaks as bubonic plague requires caution.