The Turkish War of Independence ( `` War of Liberation '' , also known figuratively as `` İstiklâl Harbi '' `` Independence War '' or `` Millî Mücadele '' `` National Campaign '' ; 19 May 1919 – 24 July 1923 ) was fought Hostile_encounter between the Turkish National Movement and the proxies of the Allies – namely Greece on the Western Front , Armenia on the Eastern , France on the Southern , the royalists and the separatists in various cities , and with them , the United Kingdom and Italy in Constantinople ( now Istanbul ) – after parts of the Ottoman Empire were occupied and partitioned following the Ottomans ' defeat Conquering in World War I .