Serbo-Bulgarian War

The Serbo-Bulgarian War was a war between the Kingdom of Serbia and Principality of Bulgaria that erupted on 14 November 1885 and lasted until 28 November 1885. Final peace was signed on 3 March 1886 in Bucharest. As a result of the war, European powers acknowledged the act of Unification of Bulgaria which happened on 18 September 1885.

Major Battles

 * Battle at the Dragoman Pass (1885) - Serbian soldiers marching to flank the Bulgarian line from the north are halted by entrenched Bulgarian soldiers along the road toward Slivnitsa. The Serbians try 3 attacks, but all fail due to being outgunned by the Bulgarians. A Serbian relief column arrived, surprising the Bulgarian forces and pushing them out of their positions, but the Bulgarians eventually reorganize and launch a successful counterattack, retaking their positions. (Bulgarian Victory)
 * Battle of Karnul (1885) - Two Serbian divisions launch an attack on a lone Bulgarian division in Karnul, almost achieving victory. Right before Karnul falls, three Bulgarian relief divisions arrive, quickly outnumbering the Serbians and pushing them back. A counterattack is launched at night, pushing the Serbians back even further. (Bulgarian Victory)
 * Battle of Slivintsa (1885) - With the entire Serbian Army in retreat, the Bulgarians move to push the Serbian Army out of Northern Bulgaria. The six Bulgarian divisions face three Serbian rearguard divisions, with almost no defense prepared. The Bulgarians overrun Slivintsa, and rout the Serbian Army in the North. (Bulgarian Victory)
 * Siege of Vidin (1885) - Serbian soldiers surround and bomb Bulgarian soldiers at Vidin. After multiple repulsed attacks, the Serbians besieging the town were routed by Bulgarian relief divisions, Pushing the Serbian Army out of Central Bulgaria. (Bulgarian Victory)
 * Battle of Pirot (1885) - The last battle of the War, the Bulgarian Army invades Serbia at the town of Pirot, where the main Serbian Army retreated to, and dug in. The Bulgarian Army launches a small attack as a distraction while the main Army flanks the town and routs the Serbian forces. (Bulgarian Victory)

Peace Treaty
The Serbian defeat made Austria-Hungary take action. On 28 November, the Viennese ambassador in Belgrade visited the headquarters of the Bulgarian Army and demanded the cessation of military actions, threatening that otherwise the Bulgarian forces would face Austro-Hungarian troops. The ceasefire was signed on 28 November. On 3 March 1886 the peace treaty was signed in Bucharest. According to its terms, no changes were to be made along the Bulgarian-Serbian border. The defeat left a lasting scar on the Serbian military, previously considered by the Serbian people to be undefeated.