Timeline Home | to 1000 | 1001-1200 | 1201-1400 | 1401-1600 | 1601-1800 | 1901-present
1820s
- March 17, 1821 - Greek War of Independence: The Maniots at Areopoli declare war on the Turks beginning the Greek War of Independence
- 1825 - Java War: Fighting begins between the Javanese under Prince Diponegoro and Dutch colonial forces
- October 20, 1827 - Greek War of Independence: An allied fleet defeats the Ottomans at the Battle of Navarino
1830s
- 1830 - Java War: The conflict ends in a Dutch victory after Prince Diponegoro is captured
- April 5, 1832-August 27, 1832 - Blackhawk War: US troops defeat an alliance of Native American forces in Illinois, Wisconsin, and Missouri
- October 2, 1835 - Texas Revolution: The war begins with a Texan victory at the Battle of Gonzales
- December 28, 1835 - Second Seminole War: Two companies of US soldiers, under Major Francis Dade, are massacred by the Seminoles in the first action of the conflict
- March 6, 1836 - Texas Revolution: After 13 days of siege, the Alamo falls to Mexican forces
- April 21, 1836 - Texas Revolution: The Texan Army under Sam Houston defeats the Mexicans at the Battle of San Jacinto, winning independence for Texas
- December 28, 1836 - War of the Confederation: Chile declares war on the Peru-Bolivian Confederation beginning the conflict
- December 1838 - First Afghan War: A British army under General William Elphinstone marches into Afghanistan starting the war
- August 23, 1839 - First Opium War: British forces capture Hong Kong in the opening days of the war
- August 25, 1839 - War of the Confederation: Following defeat at the Battle of Yungay, the Peru-Bolivian Confederation is dissolved, ending the war
1840s
- January 5, 1842 - First Afghan War: Elphinstone's army is destroyed as it retreats from Kabul
- August 1842 - First Opium War: After winning a string of victories, the British force the Chinese to sign the Treaty of Nanjing
- April 24, 1846 - Mexican-American War: Mexican forces rout a small US cavalry detachment in the "Thornton Affair"
- May 8-9, 1846 - Mexican-American War: US forces under General Zachary Taylor defeat the Mexicans at the Battle of Palo Alto and the Battle of Resaca de la Palma
- February 22, 1847 - Mexican-American War: After capturing Monterrey, Taylor defeats Mexican General Antonio López de Santa Anna at the Battle of Buena Vista
- March 9-September 12, 1847 - Mexican-American War: Landing at Vera Cruz, US forces led by General Winfield Scott conduct a brilliant campaign and capture Mexico City, effectively ending the war
1850s
- March 28, 1854 - Crimean War: Britain and France declare war on Russia in support of the Ottoman Empire
- September 20, 184 - Crimean War: British and French forces win the Battle of Alma
- September 11, 1855 - Crimean War: After an 11-month siege, the Russian port of Sevastopol falls to British and French troops
- March 30, 1856 - Crimean War: The Treaty of Paris ends the conflict
- October 8, 1856 - Second Opium War: Chinese officials board the British ship Arrow leading to the outbreak of hostilities
1860s
- October 6, 1860 - Second Opium War: Anglo-French forces capture Beijing effectively ending the war
- April 12, 1861 - American Civil War: Confederate forces open fire on Fort Sumter beginning the Civil War
- July 21, 1861 - American Civil War: In the first major battle of the conflict, Union forces are defeated at Bull Run
- March 9, 1862 - American Civil War: USS Monitor fights CSS Virginia in the first battle between ironclads
- March 26-28, 1862 - American Civil War: Union forces successfully defend New Mexico at the Battle of Glorieta Pass
- April 25, 1862 - American Civil War: Flag Officer David G. Farragut captures New Orleans for the Union
- September 17, 1862 - American Civil War: Union forces win a strategic victory at the Battle of Antietam
- December 13, 1862 - American Civil War: The Confederates win the Battle of Fredericksburg
- July 1-3, 1863 - American Civil War: Union forces under Maj. Gen. George G. Meade win the Battle of Gettysburg and turn the tide in the East
- July 4, 1863 - American Civil War: After a six-week siege, the Confederate stronghold of Vicksburg falls to Union troops under Maj. Gen. Ulysses S. Grant
- November 23-25, 1863 - American Civil War: Union forces under Maj. Gen. Ulysses S. Grant win the Battle of Chattanooga
- February 17, 1864 - American Civil War: USS Housatonic becomes the first ship sunk by a submarine when it is attacked by H.L. Hunley
- June 19, 1864 - American Civil War: USS Kearsarge sinks the Confederate raider CSS Alabama
- September 2, 1864 - American Civil War: Union troops under Maj. Gen. William T. Sherman capture Atlanta
- April 1, 1865 - American Civil War: Major General Philip Sheridan wins the Battle of Five Forks for the Union
- April 2/3, 1865 - American Civil War: After a ten-month siege, Union forces capture Petersburg, VA, compelling Gen. Robert E. Lee to retreat west
- April 9, 1865 - American Civil War: Gen. Robert E. Lee surrenders to Lt. Gen. Ulysses S. Grant at Appomattox Court House, VA
- April 26, 1865 - American Civil War: Gen. Joseph E. Johnston surrenders to Maj. Gen. William T. Sherman at Durham, NC
- June 15, 1866-August 23, 1866 - Austro-Prussian War: Prussian forces defeat the Austrians in a lightening seven-week conflict
1870s
- July 19, 1870 - Franco-Prussian War: After Prussian provocation, France declares war on Prussia
- September 1, 1870 - Franco-Prussian War: Prussian forces crush a French army and capture Emperor Napoleon III at the Battle of Sedan
- September 19, 1870-January 28, 1871 - Franco-Prussian War: Prussian forces successfully lay siege to Paris
- May 10, 1871 - Franco-Prussian War: The Treaty of Frankfurt ends the conflict in Prussian victory
- June 25, 1876 - Indian Wars: The US 7th Cavalry under Lt. Colonel George A. Custer is routed at the Battle of the Little Bighorn
- January 22, 1879 - Anglo-Zulu War: The Zulus massacre British troops at the Battle of Isandlwana
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