April 11 Mary II and William III 1689 – William III and Mary II (both pictured) were crowned joint sovereigns of England in a ceremony at Westminster Abbey. 1809 – Napoleonic Wars: A hastily assembled Royal Navy fleet launched an assault against the main strength of the French Atlantic Fleet; an incomplete victory led to political turmoil in Britain. 1951 – U.S. president Harry S. Truman relieved General of the Army Douglas MacArthur of his commands for making public statements about the Korean War that contradicted the administration's policies. 2001 – In a FIFA World Cup qualifying match, Australia defeated American Samoa 31–0, the largest margin of victory recorded in international football. Romanos III Argyros (d. 1034)Ewelina Hańska (d. 1882)Trevor Linden (b. 1970) More anniversaries: April 10 April 11 April 12 Archive By email List of days of the year About