User:Hawkeye7/War/Selected anniversaries/September 18

September 18

 * 323 - Constantine the Great decisively defeats Licinius in the Battle of Chrysopolis, establishing Constantine's sole control over the Roman Empire.
 * 1635 - Emperor Ferdinand II declares war on France.
 * 1863 - American Civil War: Battle of Chickamauga.
 * 1939 - World War II: Polish government of Ignacy Mościcki flees to Romania.
 * 1939 - World War II: A German U-boat sinks the British aircraft carrier HMS Courageous.
 * 1940 - World War II: Italian troops conquer Sidi Barrani.
 * 1945 - Gen. Douglas MacArthur moves his command headquarters to Tokyo.
 * 1947 - The United States Air Force is created separate from the United States Army.