World War I poster announcing "Kossovo day", the Serbian National Day. In June is the celebration of the national day of the Serbians. It was chosen in commemoration of the battle of Kossovo, in 1389, one of the bloodiest and most decisive in the nation's history, when the Turks defeated the Christians, who were led by the Serbian Czar, Lazar, and Serbia's independence was lost for over 400 years. The poster depicts a drawing by Bernard Partridge, titled “Heroic Serbia” (reproduced here by special permission of the proprietors of Punch magazine), that refers to the second big attack on Serbia (1915) by the Central Power forces: Germany and Austria-Hungary from the north and west and Bulgaria, from the east. The author, Sir Bernard Partridge, was one of the finest political cartoonists ever to grace the pages of Punch, a British weekly magazine of humor and satire established in 1841.