Antigonid–Nabataean confrontations
Jan. 1, 311
Nabataean kingdom
War against Nabis
Jan. 1, 194
Laconia
Achaean War
Jan. 1, 145
Year of the Four Emperors
Jan. 1, 69
Roman Empire
Rebellion of Hermenegildo
Jan. 1, 580
Kingdom of Toledo
Rebellion of Hermenegildo
Jan. 1, 584
Kingdom of Toledo
Rus'–Byzantine War of 907
Jan. 1, 907
Constantinople
Rus'–Byzantine War (941)
Jan. 1, 941
Constantinople
Wendish Crusade
Jan. 1, 1147
Central Europe
Sixth Crusade
Jan. 1, 1220
Cyprus
Värmland military campaign
Jan. 1, 1225
Värmland
War of Saint-Sardos
Jan. 1, 1324
Duchy of Aquitaine
English invasion of Scotland
Aug. 1, 1400
Berwickshire
Hunger War
Jan. 1, 1414
State of the Teutonic Order
Tumu Crisis
Sept. 1, 1449
Huailai County
Balkan campaign of 1529
Jan. 1, 1529
Hungary
French invasion of the Isle of Wight
July 11, 1545
Isle of Wight
Ottoman invasion of the Balearic Islands
Jan. 1, 1558
Balearic Islands
Castille War
Jan. 1, 1578
Borneo
Pig War
Jan. 1, 1606
Guaraní War
Feb. 1, 1756
Misiones Orientales
Kettle War
Oct. 8, 1784
Scheldt
Polish–Russian War of 1792
Jan. 1, 1792
Polish–Lithuanian Commonwealth
invasion of Guadeloupe
Jan. 1, 1794
Guadeloupe
Persian Expedition of 1796
Jan. 1, 1796
North Caucasus
Peasants' War
Jan. 1, 1798
Southern Netherlands
Anglo-Spanish War
Jan. 1, 1808
English Channel
Swedish-Norwegian War
Jan. 1, 1814
Kingdom of Norway (1814)
Arikara War
Aug. 1, 1823
Mexican–American War
Jan. 1, 1840
Mexico
Hungarian Revolution of 1848
Jan. 1, 1848
Kingdom of Hungary
Hungarian Revolution of 1848
Jan. 1, 1849
Kingdom of Hungary
Colombian civil war, 1854
Jan. 1, 1854
Republic of New Granada
Indian Rebellion of 1857
Jan. 1, 1857
India
McGowan's War
Jan. 1, 1858
Yale, British Columbia
Pig War
Jan. 1, 1859
San Juan Islands
Paiute War
Jan. 1, 1860
Pyramid Lake
Dakota War of 1862
Jan. 1, 1862
Minnesota
Dakota War of 1862
Jan. 1, 1862
Dakota Territory
Ecuadorian–Colombian War
Jan. 1, 1863
United States of Colombia
Kake War
Feb. 1, 1869
Kake
Bannock War
Jan. 1, 1878
Idaho
Greco-Turkish War (1897)
Jan. 1, 1897
Greece
Romania during World War I
Nov. 10, 1918
Romania
Saudi–Yemeni War
Jan. 1, 1934
Saudi Arabia
Anglo-Iraqi War
Jan. 1, 1941
Kingdom of Iraq
Invasion of Tulagi
Jan. 1, 1942
Solomon Islands
Indo-Pakistani War of 1947
Jan. 1, 1947
Kashmir
Paraguayan Civil War of 1947
Jan. 1, 1947
Paraguay
The Fairgrounds Park Riot
June 21, 1949
St. Louis
Sand War
Oct. 1, 1963
Tindouf Province
Dirty War
Jan. 1, 1970
Argentina
Lebanon War
Jan. 1, 1982
Lebanon
2003 invasion of Iraq
Jan. 1, 2003
Iraq
2018 Kerch Strait incident
Nov. 25, 2018
Strait of Kerch