April in Military History
April marks some of history's most consequential moments: the start of the American Revolution, the fall of Berlin, and the end of the Civil War.
318 events across 30 days
Featured Events in April
April 1
Operation Iceberg: The Invasion of Okinawa
1945
April 2
Argentina Invades the Falkland Islands
1982
April 3
Union Forces Capture Richmond
1865
April 4
NATO: The North Atlantic Treaty Signed
Twelve nations signed the North Atlantic Treaty in Washington, D.C., creating NATO, the first peacetime military alliance the United States joined outside the Western Hemisphere. Article 5 established collective defense: an attack on one member would be considered an attack on all.
April 5
Siege of Sarajevo Begins
Bosnian Serb forces began the siege of Sarajevo, which would last 1,425 days, the longest siege of a capital city in modern warfare. Snipers opened fire on a peace march of 100,000 demonstrators, killing six, marking the start of a conflict that claimed over 11,500 lives in the city alone.
Every Day in April
Operation Iceberg: The Invasion of Okinawa
11 events · 1945
Argentina Invades the Falkland Islands
11 events · 1982
Union Forces Capture Richmond
11 events · 1865
NATO: The North Atlantic Treaty Signed
11 events · 1949
Siege of Sarajevo Begins
11 events · 1992
United States Declares War on Germany
11 events · 1917
Sinking of the Battleship Yamato
11 events · 1945
Fall of Baghdad
11 events · 2003
Lee Surrenders at Appomattox Court House
11 events · 1865
Loss of USS Thresher
11 events · 1963
Truman Relieves General MacArthur
10 events · 1951
Confederate Forces Fire on Fort Sumter
10 events · 1861
Germany Announces Discovery of Katyn Massacre
10 events · 1943
Abraham Lincoln Shot at Ford's Theatre
10 events · 1865
President Abraham Lincoln Dies
10 events · 1865
Battle of Seelow Heights Begins
10 events · 1945
Bay of Pigs Invasion Begins
10 events · 1961
The Doolittle Raid on Tokyo
10 events · 1942
Battles of Lexington and Concord
10 events · 1775
Robert E. Lee Resigns from the US Army
10 events · 1861
Battle of San Jacinto
10 events · 1836
First Poison Gas Attack at Ypres
10 events · 1915
The Zeebrugge Raid
11 events · 1918
Operation Eagle Claw Fails in Iran
11 events · 1980
The Gallipoli Landings, ANZAC Day
11 events · 1915
The Bombing of Guernica
11 events · 1937
The Sinking of the SS Sultana
11 events · 1865
Execution of Benito Mussolini
11 events · 1945
Liberation of Dachau Concentration Camp
11 events · 1945
The Fall of Saigon
11 events · 1975
Notable Military Figures Born in April
April 1
Otto von Bismarck
Minister President of Prussia, Chancellor of the German Empire
Prussian statesman who orchestrated three decisive wars against Denmark, Austria, and France to unify Germany under Prussian leadership. Known as the "Iron Chancellor," his military and diplomatic strategies reshaped the European balance of power for half a century.
1815–1898
April 1
Florence Blanchfield
Colonel, U.S. Army Nurse Corps
Superintendent of the Army Nurse Corps during World War II who oversaw 60,000 nurses serving on every front. She became the first woman to receive a regular commission in the U.S. Army in 1947.
1884–1971
April 1
William Manchester
Sergeant, U.S. Marines
Marine who served at Okinawa and was severely wounded in combat. He became a renowned military historian, writing "Goodbye, Darkness" (his Pacific War memoir) and "American Caesar" (a biography of MacArthur).
1922–2004
April 2
Charlemagne
King of the Franks, Emperor of the Holy Roman Empire
One of history's greatest military conquerors who waged nearly three decades of continuous campaigns to unite most of Western Europe, including a 30-year war against the Saxons. His empire became the foundation of modern France and Germany.
742–814
April 2
Francis Gabreski
Colonel, U.S. Air Force
One of the top American fighter aces of World War II with 28 aerial victories in P-47 Thunderbolts, and 6.5 more victories in the Korean War flying F-86 Sabres, one of only seven pilots to become aces in both wars.
1919–2002
April 3
Alexander Macomb
Major General, U.S. Army
Commanding General of the United States Army from 1828 until his death. Known as "The Hero of Plattsburgh" for commanding the decisive American victory at the Battle of Plattsburgh during the War of 1812.
1782–1841
April 3
Charles Wilkes
Rear Admiral, U.S. Navy
Navy explorer who led the United States Exploring Expedition (1838-1842). During the Civil War, he caused the Trent Affair by intercepting a British mail ship and removing Confederate diplomats, nearly provoking war with Britain.
1798–1877
April 4
Dorothea Dix
Superintendent of Army Nurses
Social reformer who became the Union Army's Superintendent of Army Nurses during the Civil War, organizing and overseeing the nursing corps that treated soldiers from both sides. Known as "Dragon Dix" for her strict professional standards.
1802–1887
April 4
Bobby Ray Inman
Admiral, U.S. Navy
Four-star admiral who served as Director of the National Security Agency and Deputy Director of the CIA. He was the first naval intelligence specialist to achieve four-star rank during a distinguished 31-year career.
1931–present
April 5
Colin Powell
General, Chairman of the Joint Chiefs of Staff
First African American to serve as Chairman of the Joint Chiefs of Staff (1989-1993) and Secretary of State (2001-2005). A Vietnam veteran who oversaw Operations Desert Shield and Desert Storm.
1937–2021
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About April in Military History
April has witnessed 318 significant military events spanning from the American Revolution to the modern era. Each day of April carries its own story of battles, innovations, sacrifices, and turning points that shaped the course of military history.
Our day-by-day coverage includes detailed narratives, historical context, images from military archives, and connections to our broader library of military history articles. Whether you're researching a specific date or browsing for fascinating stories, April has no shortage of compelling military history.