Constantine the Great became sole emperor after winning two civil wars.

Civil war against Maxentius. Constantine fought against Maxentius, the son of former emperor Maximian who usurped the tile of emperor in the west following riots in the city of Rome. Constantine defeated his armies at Turin and Verona in the spring of 312. He then defeated Maxentius at the Battle of the Milvian Bridge just outside Rome, which won the war in October 312.

Civil war against Licinius.Constantine fought co-emperor Licinius. Constantine won the Battle of Cibalae (in modern Croatia) in October 314 or 316. The Battle of Mardia (in Bulgaria or Greece) in late 316 or early 317 was indecisive. A peace deal was made, but it broke down when Licinius started to persecute the Christians. Constantine won the Battle of Adrianople (in European Turkey close to the Greek border) in July 324. Constantine's eldest son, Crispus, won the naval Battle of Hellespont (the Dardanelles, a strait between the Mediterranean and the Sea of Marmara, southwest of Istanbul) in July 324. Constantine won the final Battle of Chrysopolis (in Asian Turkey, opposite Istanbul) in September 324.

Battle of the River Plate

Battle of Britain

The Battle of Gazala

The Battle of El Alamein

The Battle of Moscow

The Battle of Stalingrad

The fall of Singapore

The Battle of Kursk

The Battle of Brittany

The Battle of Arnhem

The Battle of the Bulge

The Battle of Berlin

The Battle of Coral Sea

The Battle of Midway

The Battle of Guadalcanal

The Battle of the Philippine Sea

The Battle of Iwo Jima

The Battle of Okinawa