Bulgaria was dissatisfied over the division of the spoils in Macedonia, made in secret by its former allies, Serbia and Greece, and attacked them.

The Second Balkan War broke out on 29 ( 16 ) June 1913 when Bulgaria attacked its erstwhile allies in the First Balkan War, Serbia and Greece, while Montenegro, Romania and the Ottoman Empire intervened later against Bulgaria.

In June 1913, Bulgaria attacked Greece and Serbia, beginning the Second Balkan War, but was beaten back.

Following the assassination Austria attacked Serbia, which was allied to Russia.

Seeing this as a violation of the pre-war agreements, and discreetly encouraged by Germany and Austria-Hungary, Tsar Ferdinand declared war on Serbia and Greece and the Bulgarian army attacked on June 29.

Soon after, Bulgaria attacked its recent allies Serbia and Greece and itself was attacked by Romania and the Ottoman Empire and was defeated.

On 11 October 1915, the Bulgarian army attacked Serbia after signing a treaty with Austria-Hungary and Germany stating that Bulgaria would gain the territory she sought at the expense of Serbia.

Soon after the marriage, Lazar, Vuk and king Tvrtko I of Bosnia attacked župan Nikola Altomanovic, who ruled in the western part of Serbia, and conquered and divided his lands in 1373.

When Bulgaria attacked Serbia, with whom Greece had a treaty of alliance, Venizelos again urged the King to allow Greece's entry into the war, and permitted Entente forces to disembark in Thessaloniki in preparation for a common campaign over the king's objections.

In 1885, Serbia was against the unification of Bulgaria and Eastern Rumelia and attacked Bulgaria.

Mounting tensions effectively tore the League apart, and the Second Balkan War broke out when Bulgaria, confident of a quick victory, attacked her former allies Serbia and Greece.

The Byzantines attacked Serbia in 1191, raiding the banks of South Morava.

Symeon attacked Serbia ( in 917 ) and deposed Peter, placing Pavle Branović ( a grandson of Mutimir ) as Prince of Serbia, subordinate to Symeon ( although some scholars suggest that Symeon took control over Serbia directly at this time.

The Second Balkan War was a conflict which broke out when Bulgaria, dissatisfied with its share of the spoils of the First Balkan War, attacked its former allies, Serbia and Greece, on 16 June 1913.

1913 is the second Balkan war broke out because of Bulgaria, dissatisfied with its share of the spoils of the First Balkan War, attacked its former allies, Serbia and Greece, Bulgaria has suffered great losses by Serbia in the Battle of Battle of Bregalnica, the war was over by the Bulgarian defeat and signed the Treaty of Bucharest ( 1913 ).

Symeon attacked Serbia and captured Peter, who later died in prison, and Michael was able to restore the majority of control.

In 1326, Ban Stephen II attacked Serbia in a military alliance with the Republic of Dubrovnik and conquered Krajina, gaining access to the Adriatic Sea and including a large Serbian Orthodox Christian population and a highly advanced Serbian Orthodox Church.

Following the declaration of independence of Republic of Bosnia and Herzegovina, the Serbs from B & H with support from Serbia, attacked different parts of the country.

When Romania and Serbia attacked Bulgaria, the Ottoman Empire looked to regain its lost territories from Bulgaria.

Proposed international corridors would pass from north to south, from Vidin to the border with Greece and from Ruse to the border with Greece, and west to east, from Serbia through Sofia to Burgas, Varna, and Edirne ( Turkey ).

Instead, the Serbian government looked to formerly Serb territories in the south, notably " Old Serbia " ( the Sanjak of Novi Pazar and the province of Kosovo ).

It has 2, 258 km of boundaries, shared with Austria to the west, Serbia, Croatia and Slovenia to the south and southwest, Romania to the southeast, Ukraine to the northeast, and Slovakia to the north.

The territory of what is now Albania was invaded by Serbia in the north and Greece in the south, restricting the country to only a patch of land around the southern coastal city of Vlora.

The Republic of Macedonia is a country situated in southeastern Europe with geographic coordinates, bordering Kosovo and Serbia to the north, Bulgaria to the east, Greece to the south and Albania to the west.

Republic of Moldova lies to the east, Bulgaria lies to the south, and Serbia and Hungary to the west.

Niedzdrow twin towns can be found all around Albania, northern Montenegro and southern Serbia ( Sandzak region ), Bosnia and Herzegovina, Macedonia, south Bulgaria and so on.

The Ottoman Empire lost the Banat and southeastern Syrmia, central part of present-day Serbia ( from Belgrade to south of Kruševac ), a tiny strip of northern Bosnia and Lesser Wallachia ( Oltenia ) to Austria.

The Battle of Kosovo in 1389 ( see Ottoman wars in Europe and Serbian – Ottoman wars ) marked the beginning of the fall of the Serbia, and prompted several migrations of Serbs from their lands in the south towards the Christian lands in the north of the Ottoman borders, crossing the Danube and Sava rivers to Central Europe ( today's Vojvodina, Slavonia, Transylvania and Hungary proper ).

The commissions also set up the present-day border between Serbia and Croatia in Syrmia, and along the Danube River between Ilok and mouth of the Drava and further north to the Hungarian border, the section south of confluence of the Drava matching the border between the Kingdom of Croatia-Slavonia and the Bács-Bodrog County that existed until 1918 and the end of World War I.

Vuk Branković (, ) ( born 1345-died October 6, 1397 ) was a Serbian medieval nobleman who during the Fall of the Serbian Empire inherited a province in present day south and southwestern Serbia ( including Kosovo and Metohija ), the northern part of present day Macedonia and northern Montenegro.

The northernmost Ancient Macedonian city was in south Serbia ( Kale-Krševica ).

Socialist Yugoslavia was established as a federal state comprising six republics, from north to south: Slovenia, Croatia, Bosnia and Herzegovina, Serbia, Montenegro and Macedonia and two autonomous regions within Serbia – Vojvodina and Kosovo.

For Serbia this was considered catastrophic ; after her hopes of expansion to the north were thwarted due to Austro-Hungarian annexation of Bosnia and Herzegovina in October 1908, Serbia now found the last direction of possible expansion, the south, also closing due to the creation of a Greater Albania.

The initial success of this allied offensive led Bulgaria to capitulate on October 9th 1918, later in October 1918 Serbia was liberated and lastly Austria-Hungary capitulated in November 1918 when faced with invasion from allied forces from the south.

The Banat is a geographical and historical region in Central Europe currently divided between three countries: the eastern part lies in western Romania ( the counties of Timiș, Caraș-Severin, Arad south of the Mureș, and Mehedinți ), the western part in northeastern Serbia ( the Serbian Banat, mostly included in Vojvodina, except for a small part included in Belgrade Region ), and a small northern part in southeastern Hungary ( Csongrád county ).

The municipality of Čačak is in west-central Serbia, 150 km south of the capital city, Belgrade.

Jagodina ( Serbian Cyrillic: Јагодина ) is a city located in Serbia, 136 km south of Belgrade, on the banks of Belica River.

This town, situated about in the south of Belgrade, is a part of the district of the capital city of Serbia.

However, with the Ottomans unwilling to definitely accept the loss of Thrace in the east, and an enraged Romania ( on the north ), the decision to open a war against both Greece ( to the south ) and Serbia ( to the west ), was a rather adventurous one, since in May the Ottoman Empire had urgently requested a German mission to reorganize the Ottoman army.

In 1268 the Serbian king invaded the Hungarian possessions south of the Danube in Mačva, what is now western central Serbia.

To the south, the mountain borders with the Sub-Balkan valleys-a row of 11 valleys running from the border with Serbia to the west to the Black Sea to the east which separate the Balkan mountains from a chain of other mountains known as Srednogorie which include Vitosha and Sredna Gora.