Wikipedia:Selected anniversaries/July 22
July 22: Pi Approximation Day, feast day of Mary Magdalene.
- 1812 – Peninsular War: Near Salamanca, Spain, an Anglo-Portuguese force led by Arthur Wellesley inflicted a severe defeat on Marshal Auguste Marmont and his French troops in the Battle of Salamanca.
- 1864 – American Civil War: Confederate forces unsuccessfully attacked Union troops in the Battle of Atlanta.
- 1933 – Wiley Post became the first pilot to fly a fixed-wing aircraft solo around the world.
- 1934 – Bank robber John Dillinger, the U.S. Federal Bureau of Investigation's "Public Enemy Number One", was shot dead by police in an ambush in Chicago.
- 1946 – An Irgun bomb destroyed the headquarters of the British Mandate of Palestine at the King David Hotel in Jerusalem, killing 90.
- 2003 – Coalition forces attacked a compound in Mosul, Iraq, killing two of Saddam Hussein's sons, Uday and Qusay.