The Christmas Uprising (), also known as the Christmas Rebellion (, ), was a failed uprising in Montenegro led by the Greens in early January 1919. The military leader of the uprising was Krsto Popović and its political leader was Jovan Plamenac.
The catalyst for the uprising was a decision of the controversial Great National Assembly of the Serb People in Montenegro, commonly known as the Podgorica Assembly. The assembly decided to directly unify the Kingdom of Montenegro with the Kingdom of Serbia, which would shortly after become the Kingdom of Yugoslavia. Following a questionable candidate selection process, the unionist Whites outnumbered the Greens, who were in favour of preserving Montenegrin statehood and unification in a confederal Dual Monarchy with Yugoslavia.

The uprising reached a climax in Cetinje on 7 January 1919, which was the date of Eastern Orthodox Christmas. The unionists with support from the Serbian Army defeated the rebel Greens. In the aftermath of the uprising, the dethroned King Nikola of Montenegro was forced to issue a call for peace, since many homes were destroyed. As a result of the uprising, a number of participants complicit in the uprising were tried and imprisoned. Other participants in the uprising fled to the Kingdom of Italy, meanwhile some retreated to the mountains and continued guerrilla resistance under the banner of the Montenegrin Army in exile, which lasted until 1929. The most notable guerilla militia leader was Savo Raspopović.

Background
Multiple historians acknowledge that a majority of Montenegrins supported the unification with other Southern Slavs on a federal basis after the World War I. However, support for unification did not involve the same degree of support for the Podgorica Assembly, since many of those who supported unification wanted Montenegro to join the Kingdom of Serbs, Croats, and Slovenes as an autonomous entity, ultimately in a confederation rather than a centralized Serbian kingdom.

Plan
The plan of the Greens consisted of six points.
Vojvoda , leading several rebel battalions, was to take the town of Nikšić. From there, they were to march through Čevo and Cuce to Cetinje, in coordination with rebels from Njeguši. General Milutin Vučinić, leading troops from Piperi, Lješkopolje and Zeta, was to attack Podgorica and move towards Cetinje, crossing through Lješanska nahija. His troops were to meet up with the troops of vojvoda Đuro Petrović between Čevo and Lješanska nahija. Jovan Plamenac, leading troops from Crmnica, and with the support of detachments from Ljubotinj, was to head towards Cetinje. The three groups were to attack Cetinje simultaneously to disarm the Serbian troops there, and kill them if they resisted. In the case of a victory, the plan was to transport captured Serbians to the island of Lesendro in Lake Skadar. Rebels were instructed to carry food for three days, and the government in exile in Neuilly-sur-Seine was requested to provide food for 15,000 people for twenty days, a uniform for those currently without one, rifles, machine guns, ammunition and several cannons. They were to send the food and equipment to a place near Lake Skadar. When the entirety of Montenegro is freed, the government in exile would begin sending food more regularly to the civilian population. Expecting a counter-attack from the Vasojevići and Serbians, the government in exile was requested to facilitate the creation of bands of Albanian fighters which would attack them between Peć and Plav. For this reason, the government in exile was to supply Jovan Plamenac with 1.200.000 francs. The government in exile was to inform the world of the public opinion in Montenegro.
This plan was delivered to Antonio Baldacci on 14 December 1918.
Rebellion
Fighting around Podgorica
The rebellion first broke out around Podgorica. Some Martinići headed by commanders Stevan and Bogić Radović took control of Spuž Fortress. The Piperi headed by Brigadier General Milutin Vučinić severed the road between Danilovgrad and Podgorica at Vranićke Njive. Commander Andrija and Captain Mato Raičević seized Velje Brdo overlooking Podgorica.





