Serbian campaign

The Serbian campaign was a series of military expeditions during World War I. These expeditions were launched by the Central Powers against the Kingdom of Serbia. The conflict occurred between 1914 and 1918 in the Balkan region. It was a major part of the larger global war. The campaign significantly changed the borders and populations of Eastern Europe.

Before the war, tensions were high in the Balkans. This area was often called the "powder keg of Europe." Austria-Hungary had annexed Bosnia and Herzegovina in 1908. This move angered Serbia and the Russian Empire. In June 1914, a Bosnian Serb student named Gavrilo Princip assassinated Archduke Franz Ferdinand. The Archduke was the heir to the Austro-Hungarian throne.

This event triggered the July Crisis. Austria-Hungary then issued a July Ultimatum to Serbia. This was a list of ten demands. The demands were meant to be unacceptable to provoke war. Serbia agreed to eight of them. Austria-Hungary declared war on July 28, 1914.

The first campaign began in 1914 under Austrian General Oskar Potiorek. The Austro-Hungarian leadership called it a "punitive expedition." This meant the goal was to punish Serbia. Austria-Hungary had a massive military power. They could increase their army to 3,350,000 men during mobilization. However, many of their soldiers faced challenges. About one-quarter of them were illiterate. Many spoke different languages like Czech or Slovak. Serbia had a smaller but experienced army. They mobilized about 450,000 men. These men were organized into three age groups called "bans." The Serbian army lacked modern equipment. They only had 180,000 modern rifles. This left many soldiers without proper weapons. Despite these struggles, Serbia won a major victory at the Battle of Cer. This was the first Allied victory of the war.

The second campaign began nearly a year later. It started on October 6, 1915. This invasion was under German command. Field Marshal August von Mackensen led the forces. German, Austro-Hungarian, and Bulgarian armies attacked from three sides. This attack stopped an Allied advance from Salonica. The invasion forced a "Great Retreat." Serbian forces had to move through Montenegro and Albania to reach Greece. This retreat was a very difficult time for the people.

After the invasion, the Central Powers occupied Serbia. They divided the land between Austria-Hungary and Bulgaria. This gave the Central Powers control over the Balkans. It opened a land route from Berlin to Constantinople. This allowed Germany to send supplies to the Ottoman Empire.

In 1918, the situation began to change. The Allies launched the Vardar Offensive in September. This offensive broke the Macedonian front. It defeated the Bulgarian and German allies in that area. A combined Franco-Serbian force then moved into occupied lands. They worked to liberate Serbia, Albania, and Montenegro. The Serbian army finally entered Belgrade on November 1, 1918.

This marked the end of the long military campaign.

The war caused massive losses for the Serbian people. The army was much smaller at the end than at the start. It dropped from 420,000 soldiers to about 100,000. The human cost was very high. Some Serbian sources say over 1,200,000 people died. This was more than 29% of the total population. For the male population, the loss was 60%. Recent historical analysis gives different numbers. It estimates that 177,000 Serbian soldiers died or were lost in captivity. The civilian death toll is estimated in the hundreds of thousands.

By comparison, other nations lost smaller percentages of their people. France lost 16.8% and Germany lost 15.4%. Serbia's losses were much higher relative to its size.

The Serbian campaign shows how local conflicts can grow into global wars. A single assassination led to a massive struggle between empires. The war changed how borders were drawn in the Balkans. It also showed how much a small nation could resist larger powers. The struggle for independence shaped the future of the region for many years.