Montenegro covered the Serbian retreat towards the Adriatic coast in the Battle of Mojkovac in 6–7 January 1916, but ultimately the Austrians also conquered Montenegro. The surviving Serbian soldiers were evacuated by ship to Greece.
On 12 September 1944, King Peter II called on all Yugoslavs to come together under Tito's leadership and stated that those who did not were "traitors", by which time Tito was recognized by all Allied authorities (including the government-in-exile) as the Prime Minister of Yugoslavia, in addition to commander-in-chief of the Yugoslav forces.
On 28 September 1944, the Telegraph Agency of the Soviet Union (TASS) reported that Tito signed an agreement with the Soviet Union allowing "temporary entry" of Soviet troops into Yugoslav territory, which allowed the Red Army to assist in operations in the northeastern areas of Yugoslavia.
Yugoslav intelligence was charged with imprisoning and bringing to trial large numbers of Nazi collaborators; controversially, this included Catholic clergymen due to the widespread involvement of Croatian Catholic clergy with the Ustaša regime. Draža Mihailović was found guilty of collaboration, high treason, and war crimes and was subsequently executed by firing squad on July 1946.
In April 1969, Tito removed generals Ivan Gošnjak and Rade Hamović in the aftermath of the invasion of Czechoslovakia due to the unpreparedness of the Yugoslav army to respond to a similar invasion of Yugoslavia.
In August 1988, meetings by supporters of the Anti-Bureaucratic Revolution were held in many locations in Serbia and Montenegro, with increasingly violent nature, with calls being heard such as "Give us arms!", "We want weapons!", "Long live Serbia—death to Albanians!", and "Montenegro is Serbia!".
On 10 January 1989, the anti-bureaucratic revolution continued in Montenegro, which had the lowest average monthly wage in Yugoslavia, an unemployment rate of nearly 25 percent, and where one-fifth of the population lived below the poverty line. 50,000 demonstrators gathered in the Montenegrin capital of Titograd (now Podgorica) to protest the republic's economic situation and to demand the resignation of its leadership.
Serbia and Montenegro agreed to create the new Yugoslav federation called the Federal Republic of Yugoslavia in 1992, which dismantled the remaining communist infrastructure and created a federal democratic multiparty system of government.