Civil wars starkly demonstrate that even peoples sharing ethnicity, culture, history, and geography can plunge into bloody shameful conflict. While some view civil war as the most disgraceful form of warfare, the French theologian François Fénelon once mused, “All wars are civil wars, because all men are brothers.”
10 Bosnian War
The Bosnian War erupted after Bosnia and Herzegovina declared independence in 1991, igniting a four‑year bloodletting that pitted Bosniak Muslims, Orthodox Serbs, and Catholic Croats against one another. In early April 1992, well‑armed Bosnian Serb forces, backed by neighboring Serbia, laid siege to Sarajevo, bombarding the capital with rockets, mortars, and snipers for nearly three and a half years.
Across the countryside, nationalist Croat and Serb units carried out ruthless ethnic‑cleansing campaigns, targeting civilian populations regardless of their own ethnicity. The conflict finally wound down in 1995 after UN air strikes and sanctions forced the parties to negotiate a peace accord. Death toll estimates vary widely, ranging from 90,000 to 300,000 victims.
9 Nigerian Civil War
The Nigerian Civil War, also known as the Biafran War, ignited on July 6, 1967, when federal troops marched into the secessionist state of Biafra. Nigeria’s borders, drawn by the British colonial administration, ignored the country’s vast tapestry of nearly three hundred ethnic groups, religious affiliations, and linguistic divisions.
What began as a political struggle quickly devolved into a humanitarian catastrophe. An estimated three million people perished, most from starvation and disease, making it one of the bloodiest civil wars of recent decades. The conflict left deep economic scars and tarnished Nigeria’s standing on the world stage.
8 Thousand Days’ War
The Colombian War of a Thousand Days (1899‑1902) pitted the Conservative Party against the Liberal Party and its radical factions. The Liberals, representing coffee plantation owners and wealthy merchants, championed laissez‑faire economics, while the Conservatives had dominated politics since 1885.
A precipitous drop in international coffee prices devastated Liberal livelihoods, prompting them to take up arms. Over three years of guerrilla‑style fighting, more than 100,000 people died, vast tracts of property were razed, and the national economy was crippled. The war finally ended when the Conservatives offered amnesty and political reform in 1902, leading to the surrender of key Liberal leaders.
7 Sri Lankan Civil War
The twenty‑six‑year Sri Lankan Civil War (1983‑2009) raged between the government forces and the Liberation Tigers of Tamil Eelam (LTTE). In its final phase, the UN reported over 100,000 deaths, with at least 40,000 civilians killed in the five months leading up to the LTTE’s surrender in May 2009.
While the cessation of hostilities was welcomed by many, the post‑war era has been marked by a lack of accountability for alleged war crimes. In February 2013, UN Human Rights High Commissioner Navi Pillay condemned Sri Lanka for breaking promises to investigate wartime atrocities.
6 Angolan Civil War
Angola’s hard‑won independence from Portugal in 1975 quickly gave way to a brutal civil war as rival factions vied for power. The conflict centered on a rivalry between the Marxist‑leaning MPLA and the anti‑communist UNITA, each backed by Cold‑War superpowers.
Spanning nearly 27 years, the war claimed at least 500,000 lives and left the nation’s economy in ruins. The conflict finally ended in 2002 when UNITA leader Jonas Savimbi was killed, prompting a ceasefire and subsequent elections.
5 Secret War (Bloody Shameful Laotian Conflict)
The so‑called “Secret War” in Laos became a grim testament to Cold‑War machinations. Orchestrated by the United States, the covert operation involved massive bombing campaigns, political deception, and a staggering disregard for civilian welfare.
Estimates suggest up to 450,000 Laotian civilians and 600,000 Cambodians perished, with refugees numbering over a million. The extensive use of toxic chemical defoliants, notably Agent Orange, unleashed a lasting health crisis that still afflicts children, nursing mothers, the elderly, and the infirm.
4 Somali Civil War
Somalia’s civil war, ignited in the early 1990s after the ousting of dictator Siad Barre, fragmented the nation into rival clan militias and self‑declared autonomous regions. The conflict has persisted for decades, with the United Nations deploying peacekeepers to distribute aid and assist in reconstruction.
Unofficial estimates suggest nearly one million lives have been lost to war‑related causes, leaving the country in a state of chronic instability and humanitarian crisis.
3 Taiping Rebellion
The Taiping Rebellion (1850‑1864) stands as one of the deadliest civil wars ever recorded. Its charismatic leader, Hong Xiuquan, claimed divine mandate after a failed imperial examination and a subsequent 30‑day delirium.
Mobilizing millions of impoverished peasants, Hong proclaimed the Heavenly Kingdom of Great Harmony and seized control of over a third of China by the late 1850s. The Qing dynasty eventually quelled the uprising after fifteen years of brutal fighting, with death estimates exceeding twenty million.
2 Wars of the Roses
The Wars of the Roses (1455‑1485) pitted the red‑rose Lancasters against the white‑rose Yorks, two branches of the Plantagenet dynasty vying for the English throne. The conflict ignited after Richard II’s overthrow in 1399 and erupted into open warfare at the First Battle of St Albans in 1455.
The dynastic struggle concluded with Henry VII’s accession, uniting the two houses under the Tudor Rose and ushering in the Tudor dynasty.
1 An Lushan Rebellion
The An Lushan Rebellion (755‑763 AD) remains the deadliest civil war in world history, eclipsing even the later Taiping Rebellion. Initiated by General An Lushan against the Tang dynasty, the revolt spanned the reigns of three emperors and plunged the empire into chaos.
After a series of betrayals and assassinations among An’s heirs, the Tang forces eventually quelled the uprising, but at an astronomical cost: over thirty‑five million people perished, leaving the dynasty weakened for centuries to come.