11 September 1683 in Vienna, 1924 and 1973 in Chile, and 2001 in the United States

Shortly after the attacks on the World Trade Center and the Pentagon in the United States on 11 September 2001, I learned that the Battle of Vienna, when the Ottoman Empire was defeated by a combined Habsurg and Polish-Lithuanian army, had begun on 11 September 1683. That marked the end of the Ottomans' westward expansion. I also learned that the 1973  coup d'état in Chile that the government of President Salvador Allende and established the dictatorship of General Augusto Pinochet had taken place on 11 September. Today, I read that the Chilean date was chosen in memory of a previous coup that overthrew a progressive Chilean government on 11 September 1924. (Andrew Shields, #111Words, 11 September 2023)