Upon his accession to the throne, Trajan prepared and launched a carefully planned military invasion in Dacia, a region north of the lower Danube whose inhabitants the Dacians had long been an opponent to Rome. In 101, Trajan personally crossed the Danube and defeated the armies of the Dacian king Decebalus at the Battle of Tapae.
Decebalus complied with the terms for a time, but before long he began inciting revolt. In 105 Trajan once again invaded and after a yearlong invasion ultimately defeated the Dacians by conquering their capital, Sarmizegetusa Regia. King Decebalus, cornered by the Roman cavalry, eventually committed suicide rather than being captured and humiliated in Rome.
The Carpi moved through Dacia, crossed the Danube, and emerged in Moesia where they threatened the Balkans. Establishing his headquarters in Philippopolis in Thrace, he pushed the Carpi across the Danube and chased them back into Dacia, so that by the summer of 246, he claimed victory against them, along with the title "Carpicus Maximus".
Carinus left Rome at once and set out for the east to meet Diocletian. On his way through Pannonia, he put down the usurper Sabinus Julianus and in July 285 he encountered the army of Diocletian at the Battle of the Margus River (the modern Morava River) in Moesia.
The Wallachian Revolution of 1848 was a Romanian liberal and nationalist uprising in the Principality of Wallachia. Part of the Revolutions of 1848, and closely connected with the unsuccessful revolt in the Principality of Moldavia, it sought to overturn the administration imposed by Imperial Russian authorities under the Regulamentul Organic regime, and, through many of its leaders, demanded the abolition of boyar privilege.
Romania had been allied with the Central Powers since 1882. When the war began, however, it declared its neutrality, arguing that because Austria-Hungary had itself declared war on Serbia, Romania was under no obligation to join the war. On 4 August 1916, Romania and the Entente signed the Political Treaty and Military Convention, that established the coordinates of Romania's participation in the war. In return, it received the Allies' formal sanction for Transylvania, Banat and other territories of Austria-Hungary to be annexed to Romania. The action had large popular support.
In 1916, Romania entered World War I on the side of the Allies. In doing so, Romania's goal was to unite all the territories with a Romanian national majority into one state. In the Treaty of Bucharest (1916), terms for Romania's acquisition of territories within Austria-Hungary were stipulated.
The Battle of Buchares was the last battle of the Romanian Campaign of 1916 in World War I, in which the Central Powers' combatants, led by General Erich von Falkenhayn, occupied the Romanian capital and forced the Romanian Government, as well as the remnants of the Romanian Army to retreat to Moldavia and re-establish its capital at Iaşi.
Romania was alone on the Eastern Front, a situation that far surpassed its military capabilities. Therefore, on 7 May 1918, Romania sued for peace. The prime minister of Romania, Alexandru Marghiloman, signed the Treaty of Bucharest (1918) with the Central Powers. However, this treaty was never signed by King Ferdinand of Romania.
Romania officially made peace with the Central Powers by signing the Treaty of Bucharest on 7 May 1918. Under the treaty, Romania was obliged to end the war with the Central Powers and make small territorial concessions to Austria-Hungary, ceding control of some passes in the Carpathian Mountains, and to grant oil concessions to Germany. In exchange, the Central Powers recognised the sovereignty of Romania over Bessarabia.
On 10 November 1918, taking advantage of the Central Powers' precarious situation, Romania re-entered the war on the side of the Allied forces, with similar objectives to those of 1916. King Ferdinand called for the mobilization of the Romanian army and ordered it to attack by crossing the Carpathian Mountains into Transylvania. The end of World War I that soon followed did not bring an end to fighting for the Romanian army. Its action continued into 1918 and 1919 in the Hungarian–Romanian war.
Following the 1918 Treaty of Bucharest, the bulk of the Romanian Army was demobilized. Only the 9th and 10th infantry divisions and the 1st and 2nd cavalry divisions were at full strength. However, those units were engaged in the protection of Bessarabia against the Bolshevik Soviet Russians. The 1st, 7th and 8th Vânători divisions, stationed in Moldavia, were the first units to be mobilized. The 8th was sent to Bukovina and the other two were sent to Transylvania. On 13 November, the 7th entered Transylvania at the Prisăcani River in the eastern Carpathians. The 1st then entered Transylvania at Palanca, Bacău.
On 1 December, the Union of Transylvania with Romania was officiated by the elected representatives of the Romanian people of Transylvania, who proclaimed a union with Romania. Later the Transylvanian Saxons and Banat Swabians also supported the union.
Later, Romanian units reached the line of the Maros (Mureş) River. This was a demarcation line agreed upon by the representatives of the Allied powers and Hungary at the Armistice of Belgrade. At the same time units of the German army, under the command of Marshal August von Mackensen, retreated to the west.
By 22 January 1919, the Romanian army controlled all the territory to the Maros River. The 7th and 1st divisions were spread thin, so the 2nd Division was sent to Nagyszeben and the 6th Division to Brassó (Braşov). Two new infantry divisions, the 16th and 18th, were formed from Romanian soldiers previously mobilized in the Austro-Hungarian Army. A unified command of the Romanian army in Transylvania was established.
When Kun became aware of Romanian preparations for an offensive, he fortified mountain passes in the territory controlled by the Hungarian Army. Then, on the night of 15–16 April, the Hungarians launched a preemptive attack.
When Kun declined the terms of the Vix note, Romania acted to enforce the new railway demarcation line. Romania planned to take an offensive action on 16 April 1919. The north battalion was to take Nagykároly and Nagyvárad. This would separate the elite Hungarian Székely division from the rest of the Hungarian army. The north battalion would then outflank the Hungarian Army. Simultaneously, the south battalion would advance to Máriaradna and Belényes.
On 20 April they took Nagyvárad (Oradea) and Nagyszalonta (Salonta). Rather than following the instructions of the Vix note, the Romanian army pressed on for the Tisza River, an easily defended natural military obstacle.
In June 1941, Romania joined Germany in its invasion of the Soviet Union. Jews were forced from government service, pogroms were carried out, and by March 1941 all Jews had lost their jobs and had their property confiscated.
In July 1941 Mihai Antonescu, Romania's deputy prime minister, said it was time for "total ethnic purification, for a revision of national life, and for purging our race of all those elements which are foreign to its soul, which have grown like mistletoes and darken our future".
In 2015, 11 million Romanians say they have heard about Black Friday which is 73% of the 15 million people target segment. 6.7 million plan on buying something on biggest shopping event of the year in Romania.