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Second Samori–French War
The Second Samori–French War (1891–1898) was the second and final phase of the Mandingo Wars between Samori Touré's Wassoulou Empire and French colonial forces, ending with his capture.
Second Seminole War
The Second Seminole War (1835-1842), also called the Florida War, was the Seminole resistance to forced removal under the Treaty of Payne's Landing; seven years of guerrilla war, no peace treaty, and several hundred Seminoles remaining in Florida.
Second Serbian Uprising
The Second Serbian Uprising (Други српски устанак) was an 1815 Serbian revolt against Ottoman rule, led by Miloš Obrenović after the First Uprising's collapse in 1813.
Second Sino-Japanese War (日中戦争)
The Second Sino-Japanese War (日中戦争), known in China as the War of Resistance Against Japan, was fought between China and Japan from 1937 until Japan's surrender in 1945.
Second Sudanese Civil War
The Second Sudanese Civil War (1983–2005) pitted the Government of Sudan against John Garang's SPLM/A, ending with the January 2005 Comprehensive Peace Agreement, power- and oil-wealth sharing, the 2011 South Sudan referendum, and independence in July 2011.
Second Winter Campaign
The Second Winter Campaign (Ukrainian: Другий зимовий похід), also known as the November Raid, was the final UNR Army operation of the Ukrainian War of Independence, in late 1921.
Secret War in Laos
The Secret War in Laos was a covert conflict in which the CIA backed the Royal Lao Government and Hmong forces against the communist Pathet Lao until 1975.
Security Aviation Flight 45
Security Aviation Flight 45 (SVX45) was a Part 135 charter Cessna 441 Conquest II (N128EZ) flying Anchorage to Cape Newenham LRRS, Alaska. On August 20, 2026 it crashed in fog on a second instrument approach, killing all 8 aboard; NTSB case WPR26FA309 remains ongoing.
Sedition
Sedition is conduct or speech intended to incite insurrection against a governing authority. Covers U.S. seditious conspiracy (18 U.S.C. § 2384), the 1798 Sedition Act, Brandenburg v. Ohio limits, and modern use in Hong Kong.
Sednaya Prison (سجن صيدنايا)
Sednaya Prison (سجن صيدنايا), Syria's notorious military prison 30 km north of Damascus, opened in 1987; Amnesty estimated up to 13,000 secret hangings there from 2011 to 2015 before its liberation on 8 December 2024.
Seguro Obrero massacre
The Seguro Obrero massacre (Matanza del Seguro Obrero) was the killing by Chilean Carabineros of young National Socialist Movement militants after a failed 1938 coup in Santiago.
Seizure of the Smyrtos
Seizure of the Smyrtos: UK Royal Marines and NCA boarding of the sanctioned shadow-fleet tanker Smyrtos (IMO 9389100, ex-Myrtos) in the English Channel on 14 June 2026, the first such UK seizure, with its Indian master charged under Russia sanctions regulations.
Sejny Uprising
The Sejny Uprising (Powstanie sejneńskie) was an August 1919 insurrection by Poles of the Suwałki region against Lithuanian control of Sejny, ending in a Polish victory.
Sekhukhune Wars
The Sekhukhune Wars were campaigns fought in 1876 and 1879 against Sekhukhune I of the Bapedi, first by the South African Republic and then by Britain.
Sekhukhune's resistance
Sekhukhune's resistance was the armed defense of the Bapedi kingdom in the eastern Transvaal, led by King Sekhukhune I against the South African Republic in 1876 and British forces in 1878–1879.
Selective Service Act of 1917
Selective Service Act of 1917, also the Selective Draft Act, was the US law signed by Wilson on May 18, 1917 creating the decentralized Selective Service System; 24.2 million registered, 2.8 million inducted for World War I.
Self-immolation of Aaron Bushnell
Aaron Bushnell self-immolation: on February 25, 2024, the 25-year-old active-duty US Air Force senior airman set himself on fire outside the Israeli embassy in Washington, D.C., livestreaming an "extreme act of protest" against the Gaza war, shouting "Free Palestine," and dying of his injuries.
Seljuk conquest of Anatolia
The Seljuk conquest of Anatolia was the Turkic takeover of Byzantine Anatolia from the 11th to 12th centuries, decisively advanced by the 1071 Battle of Manzikert.
Seljuk invasions of the Caucasus
The Seljuk invasions of the Caucasus were a series of Turkic Muslim campaigns and raids into Georgia, Armenia, and Azerbaijan during the 11th and early 12th centuries.
Seljuk–Ghaznavid wars
The Seljuk–Ghaznavid wars (1035–1040) ended at the Battle of Dandanaqan in 1040, when the Seljuks under Tughril and Chaghri Beg took Khurasan from the Ghaznavids.
Seoul National University Hospital massacre
The Seoul National University Hospital massacre (서울대학교 부속병원 학살 사건) was the killing of wounded South Korean soldiers and civilian patients by North Korean forces on June 28–29, 1950.
Separatist movements of India
Separatist movements of India: Kashmiri, Sikh (Khalistan), and Northeast (Naga, Mizo, Assamese, Manipuri) campaigns for independence or autonomy since 1947, their causes, Pakistan's cross-border role, and the 2025 India-Pakistan war triggered by the Pahalgam attack.
September 1, 1939
September 1, 1939 is the date Germany invaded Poland, beginning World War II in Europe, and the title of W. H. Auden's poem written that day.
September 11 attacks advance-knowledge conspiracy theories
Advance-knowledge conspiracy theories about the September 11 attacks (LIHOP/MIHOP, 'Bush did 9/11') claim US officials foresaw or enabled the attacks; official inquiries found no specific warning, and polling shows declining belief.
September 2022 Armenia–Azerbaijan clashes
Two-day border fighting of 12–15 September 2022, when Azerbaijani forces attacked Armenia proper, the deadliest escalation since the 2020 Nagorno-Karabakh war, killing several hundred soldiers and displacing thousands.
September Uprising
The September Uprising (Септемврийско въстание) was an armed rebellion organized by the Bulgarian Communist Party in September 1923 against the government of Alexander Tsankov, and was crushed within about a week.
Septemberprogramm
Septemberprogramm (September Programme, September Memorandum): secret war-aims memorandum drafted by Chancellor Bethmann Hollweg on 9 September 1914, demanding French annexations, a vassal Belgium, and Mitteleuropa hegemony; rediscovered by Fischer in 1961.
Seqiti War
The Seqiti War (1865 to 1868) was the second of three Basotho wars, fought between King Moshoeshoe I and the Orange Free State over the Caledon River frontier.
Serbia in the Yugoslav Wars
Serbia in the Yugoslav Wars refers to Serbia's role, under Slobodan Milošević, in the four wars of Yugoslavia's breakup from 1991 to 1999, including the Kosovo war and NATO bombing.
Serbian campaign
Serbian campaign: the Central Powers' operations against the Kingdom of Serbia in 1914-1915 (Serbian campaign of 1914), from the 28 July 1914 declaration of war through Cer and Kolubara to the 1915 collapse, the Albanian retreat, and the Serbian army's return on the Salonika Front.