The assassination of the Austria-Hungarian successor to the throne, Franz Ferdinand d’Este, in Sarajevo on June 28, 1914 released accumulated clashes existing between individual European powers grouped into the two enemy camps of the Triple Entente and the Triple Alliance. Only in a month, on July 28, 1814, Austria-Hungary declared war on Serbia, which was accused of plotting the assassination. In order to protect Serbia, Russia reacted against Austria-Hungary, which was immediately followed by declaration of war on Russia by Germany.
Approximately ten million soldiers and seven million civilians died in World War I. From the territory of Slovakia, approximately four hundred thousand soldiers, of which almost seventy thousand were killed, were dressed in a military uniform.
Already during the war, the Austria-Hungarian administration authority hired several architects who were designing memorials for the fallen on World War I battlefields. Also the significant Art Nouveau Slovak architect Dušan Jurkovič was among the chosen ones. In the Western Carpathians, mainly in the territory of today's Poland, Jurkovič constructed several memorials which inspired not only the postage stamp (Regietów), but also the first day cover (Przełęcz Małastowska).
The special postmark is based on the cross from Regietów. Through the postage stamp issuance, Slovenská pošta, a.s. memorialises senseless victims of the war as a memory and warning for the future.