The Battle of Kolubara (3–9 December 1914) was a major victory for Serbia over the invading Austro-Hungarian armies during World War I. The invaders were routed, and driven back across the Serbian border.

The Battle of Kolubara is one of the most important themes of all military academies in the world. The chief creator of the Serbian victory, general and marshal Živojin Mišić, took his place among the world's greatest military leaders.

After the Battle of Drina, the Serbian army retreated to the right bank of the Kolubara River. The Serbian Army had 250,000 poorly equipped soldiers, the Austro-Hungarians had a well-equipped force of 450,000 men. On 16 November 1914, the Austro-Hungarian Balkan Army group (5th and 6th Army), commanded by Field Marshal Oskar Potiorek, launched an attack across the river. Potiorek's goal was to gain control over the railroad that led from Obrenovac to Valjevo and to use it for supplying his troops instead of using muddy roads in Mačva. The 5th Army, which held the northern part of the front, captured the town of Lazarevac which was held by the Serbian 2nd Army. In the south, the 15th and 16th Corps of the 6th Army attacked the 1st Serbian Army, captured Mount Maljen on 24 November, and put the Serbian left wing in a difficult situation. On 25 November, the Austro-Hungarian 5th Army pushed back the 2nd and 3rd Armies, crossed the Ljig River and out-flanked the 1st Army.

The Kolubara (Serbian Cyrillic: Колубара, pronounced [kɔlǔbara]), is the 123 km-long river in western Serbia; it is the eastern tributary to the Sava river.

The Kolubara originates as the Obnica, in the Podgorina region of the western Serbia, on the Povlen mountain under the Medvednik peak. It flows to the north, next to the village of Bobova, bends to the west (in this part the river is also known as Jadar), and at the city of Valjevo, it meets the river Jablanica from the south and forms the Kolubara, as the river is known for the remaining course. The Obnica is 25 km long.

The Jablanica also originates from the Povlen mountain, just few kilometers away from the Obnica, under the Jablanik peak. It curves around the Parač mountain and next to the village of Balinović, before it meets the Obnica at Valjevo. The Jablanica is 24 km long.

This is also the beginning of the 90 km long region of the Kolubara valley, divided in two large parts, referred to as Upper (gornja) Kolubara and Lower (donja) Kolubara (around the Belgrade's suburb of Obrenovac).

Nikola Tesla (Serbian Cyrillic: Никола Тесла; 10 July 1856 – 7 January 1943) was a Serbian-American inventor, physicist, mechanical engineer, electrical engineer, and futurist. He was an important contributor to the use of commercial electricity, and is best known for developing the modern alternating current (AC) electrical supply system. His many revolutionary developments in the field of electromagnetism in the late 19th and early 20th centuries were based on the theories of electromagnetic technology discovered by Michael Faraday. Tesla's patents and theoretical work also formed the basis of wireless communication and the radio.

Born in the village of Smiljan (now part of Gospić, present day Croatia), Tesla was a subject of the Austrian Empire by birth and later became an American citizen. Because of his 1894 demonstration of short range wireless communication through radio and as the eventual victor in the "War of Currents", he was widely respected as one of the greatest electrical engineers who worked in America. He pioneered modern electrical engineering and many of his discoveries were of groundbreaking importance. In the United States during this time, Tesla's fame rivaled that of any other inventor or scientist in history or popular culture. Tesla demonstrated wireless energy transfer to power electronic devices in 1891, and aspired to intercontinental wireless transmission of industrial power in his unfinished Wardenclyffe Tower project.

Bora Dugić (Serbian Cyrillic: Бора Дугић) (born June 10, 1949 in Đurđevo, SR Serbia, Yugoslavia) is a Serbian musician and flautist having released a number of CD's and records as well as having performed at countless concerts.

Bora Dugić finished high school and educational college in the field of mathematics. Since a young age he played the flute and upon the completion of his highschool education he moved to the city of Kragujevac in Central Serbia. There, he became the secretary of the cultural group “Abrašević”. As he continued to become more popular due to his abilities playing the flute, Bora moved to Serbia's capital Belgrade where he joined the grand Folk Orchestra of RTV Belgrade. He is the winner of the October Award, Gold Thimble Award for constant contribution to the culture of Belgrade, and numerous other domestic and international awards.

In 2004 he celebrated 35 years of artistic work, by a grand solo concert name The Play of Spirit at the Sava Centar in Belgrade. In 2008 he appeared at the 2008 Eurovision Song Contest alongside Jelena Tomašević.

World War I (WWI), which was predominantly called the World War or the Great War from its occurrence until 1939 (World War II), and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918. It involved all the world's great powers, which were assembled in two opposing alliances: the Allies (based on the Triple Entente of the United Kingdom, France and Russia) and the Central Powers (originally centred around the Triple Alliance of Germany, Austria-Hungary and Italy; but, as Austria–Hungary had taken the offensive against the agreement, Italy did not enter into the war). These alliances both reorganised (Italy fought for the Allies), and expanded as more nations entered the war. Ultimately more than 70 million military personnel, including 60 million Europeans, were mobilised in one of the largest wars in history. More than 9 million combatants were killed, largely because of enormous increases in lethality of weapons, thanks to new technology, without corresponding improvements in protection or mobility. It was the sixth-deadliest conflict in world history, subsequently paving the way for various political changes such as revolutions in the nations involved.