
The Aden Emergency, also known as the Radfan Uprising, was an armed insurgency by NLF and FLOSY during the Cold War against the Federation of South Arabia, a protectorate of the British Empire, which now forms part of Yemen.
The aftermath of the Houthi takeover in Yemen refers to developments following the Houthis' takeover of the Yemeni capital of Sana'a and dissolution of the government, which eventually led to a civil war and the Saudi Arabian-led intervention in Yemen.

The Hanish Islands conflict was a dispute between Yemen and Eritrea over the island of Greater Hanish in the Red Sea, one of the largest in the then disputed Zukur-Hanish archipelago. Fighting took place over three days from 15 December to 17 December 1995. In 1998 the Permanent Court of Arbitration determined that most of the archipelago belonged to Yemen.
The Houthi insurgency in Yemen, also known as the Houthi rebellion, Sa'dah War, or Sa'dah conflict, was a military rebellion pitting Zaidi Shia Houthis against the Yemeni military that began in Northern Yemen and has since escalated into a full-scale civil war. The conflict was sparked in 2004 by the government's attempt to arrest Hussein Badreddin al-Houthi, a Zaidi religious leader of the Houthis and a former parliamentarian on whose head the government had placed a $55,000 bounty. Initially, most of the fighting took place in Sa'dah Governorate in northwestern Yemen, but some of the fighting spread to neighbouring governorates Hajjah, 'Amran, al-Jawf and the Saudi province of Jizan. After the Houthi takeover of the capital city Sana'a in late 2014, the insurgency became a full-blown civil war with a major Saudi-led intervention in Yemen beginning in March 2015.
The Houthi takeover in Yemen, also known as the September 21 Revolution, or 2014–15 coup d'état, was a gradual armed takeover of former Yemeni President Ali Abdullah Saleh by the Houthis and their supporters that pushed the Yemeni government from power. It had origins in Houthi-led protests that began the previous month, and escalated when the Houthis stormed the Yemeni capital Sana'a on 21 September 2014, causing the resignation of Prime Minister Mohammed Basindawa, and later the resignation of President Abdrabbuh Mansur Hadi and his ministers on 22 January 2015 after Houthi forces seized the presidential palace, residence, and key military installations, and the formation of a ruling council by Houthi militants on 6 February 2015.

The NDF Rebellion was an uprising in the Yemen Arab Republic by the National Democratic Front, under Yahya Shami, between 1978 and 1982.

The North Yemen Civil War was fought in North Yemen from 1962 to 1970 between partisans of the Mutawakkilite Kingdom and supporters of the Yemen Arab Republic. The war began with a coup d'état carried out in 1962 by revolutionary republicans led by the army under the command of Abdullah as-Sallal, who dethroned the newly crowned Imam Muhammad al-Badr and declared Yemen a republic under his presidency. The Imam escaped to the Saudi Arabian border where he rallied popular support from northern Shia tribes to retake power, escalating rapidly to a full-scale civil war.
The Ogaden War, or the Ethio-Somali war, was a Somali military offensive between July 1977 and March 1978 over the disputed Ethiopian region of Ogaden, which began with the Somali invasion of Ethiopia. The Soviet Union disapproved of the invasion and ceased its support of Somalia, instead starting to support Ethiopia. Ethiopia was saved from a major defeat and a permanent loss of territory through a massive airlift of military supplies worth $1 billion, the arrival of between 16,000-24,000 Cuban troops sent by Fidel Castro to win a second African victory, and 1,500 Soviet advisors, led by General Vasily Petrov. The Ethiopians and Cubans prevailed at Harar, Dire Dawa and Jijiga, and began to push the Somalis systematically out of the Ogaden. By March 1978, the Ethiopians and Cubans had captured almost all of the Ogaden, prompting the defeated Somalis to give up their claim to the region. The Somalis took a terrible beating from Cuban artillery and aerial assaults.

From late August to late September 2019, a military operation was carried out by Yemeni forces loyal to the Houthi-led Supreme Political Council, under the code name "Victory from God". It targeted Saudi Arabia and allied forces along the Saudi Arabia–Yemen border.

The South Yemeni Civil War, colloquially referred to as The Events of '86 or The Events of January 13, or more simply as The Events, was a failed coup d'etat and armed conflict which took place on January 13, 1986 in South Yemen. The civil war developed as a result of ideological differences, and later tribal tensions, between two factions of the ruling Yemeni Socialist Party (YSP), centred on Abdul Fattah Ismail's faction, al-Toghmah, and Ali Nasir Muhammad's faction, al-Zomrah, for the leadership of the YSP and the PDRY. The conflict quickly escalated into a costly civil war that lasted eleven days and resulted in thousands of casualties. Additionally, the conflict resulted in the demise of much of the Yemeni Socialist Party's most experienced socialist leadership cadre, contributing to a much weaker government and the country's eventual unification with North Yemen in 1990.

The South Yemen insurgency was a series of protests and attacks on government forces in southern Yemen between 2009 and 2014. Although the violence was blamed on elements within the southern secessionist movement, leaders of the group maintained that their aims of independence were to be achieved through peaceful means, and claimed that attacks were from ordinary citizens in response to the government's provocative actions. The insurgency came amid the Shia insurgency in the country's north that was led by Houthi communities. Southern leaders led a brief, unsuccessful secession in 1994 following unification. Many of them were involved in the secession movement. Southern separatist insurgents were active mainly in the area of former South Yemen, but also in Ad Dali' Governorate, which was not a part of the independent southern state.

The War on terror, also known as the Global War on Terrorism and U.S. War on Terror, is an international military campaign launched by the United States government after the September 11 attacks. The targets of the campaign are primarily Sunni Islamic fundamentalist armed groups located throughout the Muslim world, with the most prominent groups being Al-Qaeda, the Islamic State, the Taliban, Tehrik-i-Taliban Pakistan, and the various franchise groups of the former two organizations. The naming of the campaign uses a metaphor of war to refer to a variety of actions that do not constitute a specific war as traditionally defined. U.S. president George W. Bush first used the term "war on terrorism" on 16 September 2001, and then "war on terror" a few days later in a formal speech to Congress. In the latter speech, George Bush stated, "Our enemy is a radical network of terrorists and every government that supports them." The term was originally used with a particular focus on countries associated with al-Qaeda. The term was immediately criticised by such people as Richard B. Myers, chairman of the Joint Chiefs of Staff, and more nuanced terms subsequently came to be used by the Bush administration to publicly define the international campaign led by the U.S. While it was never used as a formal designation of U.S. operations in internal government documentation, a Global War on Terrorism Service Medal was issued.

The al-Wadiah War was a military conflict which broke out on 27 November 1969 between Saudi Arabia and the People's Republic of South Yemen after PRSY forces seized the town of al-Wadiah on the PRSY-Saudi Arabian border. The conflict ended on 6 December when Saudi forces retook al-Wadiah.

The Yemeni Civil War was a civil war fought between the two Yemeni forces of the pro-union northern and the socialist separatist southern Yemeni states and their supporters. The war resulted in the defeat of the southern armed forces, the reunification of Yemen, and the flight into exile of many Yemeni Socialist Party (YSP) leaders and other separatists.

The Yemeni Civil War is an ongoing multi-sided conflict that began in late 2014 mainly between two factions: the Abdrabbuh Mansur Hadi-led Yemeni government and the Houthi armed movement, along with their supporters and allies. Both claim to constitute the official government of Yemen.

The First Yemenite War was a short military conflict between the Yemen Arab Republic and the People's Democratic Republic of Yemen.

The Yemenite War of 1979 was a short military conflict between the Yemen Arab Republic and the People's Democratic Republic of Yemen. The war developed out of a breakdown in relations between the two countries after the president of North Yemen, Ahmad al-Ghashmi, was killed on 24 June 1978 and Salim Rubai Ali, a moderate Marxist who had been working on a proposed merger between the two Yemens, was murdered two days later. The hostility of the rhetoric from the new leadership of both countries escalated, leading to small scale border fighting, which then in turn escalated into a full blown war in February 1979. North Yemen appeared on the edge of a decisive defeat after a three-front invasion by South Yemeni combined arms formation, however this was prevented by a successful mediation in the form of the Kuwait Agreement of 1979, which resulted in Arab League forces being deployed to patrol the North-South border. An agreement to unite both countries was also signed, although was not implemented.