March 17: Saint Patrick's Day (Christianity); Anniversary of the Unification of Italy (1861)Dorchester Heights Monument1864 Second Schleswig War: In an attempt to end a Danish blockade, Eduard von Jachmann led a Prussian squadron in an attack against a Danish fleet led by Edvard van Dockum.1902 The Dorchester Heights Monument (pictured), memorializing the siege of Boston during the American Revolutionary War, was dedicated.1957 A plane crash on the slopes of Mount Manunggal killed Philippine president Ramon Magsaysay and 24 others.1979 The Penmanshiel Tunnel in the Scottish Borders collapsed during refurbishing construction, killing two workers, and leading to the abandonment of the tunnel.2004 Unrest in Kosovo broke out, resulting in the deaths of 28, the wounding of more than 600 others, and the destruction of several Serb Orthodox churches and shrines.Jocelin of Glasgow (d.1199)Menno van Coehoorn (d.1704)Pattie Boyd (b.1944)Shu Xiuwen (d.1969)More anniversaries: March 16March 17March 18ArchiveBy emailList of days of the yearAbout