He graduated from the Tiflis gymnasium in 1898 with honors, from the Kiev Military School in 1900, and from the Nicholas General Staff Academy in 1907.

He became a Lieutenant in 1904 and that same year he entered the Academy of the General Staff, but in early 1905 his teaching was interrupted and he went to the front of the Russian-Japanese War.

According to his biographer, Academician Hrant Avetisyan, Bagratouni carried out secret military research and practical tasks in Mongolia, Tibet, Korea, Afghanistan, and Central Asia in Bukhara, Kashgar, Kermishe, Kushka, Merv.

[1] On the eve of the coming to power of the Bolsheviks to take measures against troops loyal to the Provisional Government, the headquarters of the Northern Front ordered to send a special military unit to Petrograd.

On 7 November 1917, the newly appointed Dictator of the Provisional Government Nikolai Kishkin received authority to restore order in the city.

He immediately removed the hesitant Colonel Georgy Polkovnikov from his post as commander in chief of the Petrograd Military District and replaced him with a more energetic General Jaques Bagratuni.

[1] Bagratuni continued to work on the formation of an army corps and sending troops to Armenia and the Caucasus from late 1917 to early 1918.

He arrived in Baku on 7 March 1918 at the urging of revolutionary leader Vladimir Lenin to assist the Centrocaspian Dictatorship, headed by Stepan Shahumyan.

Despite the severe wound, he took part in the fighting during the March Days and in the defense against the Turkish and Tatar combined forces in the summer.

On September 15 at 11:00, the British, without warning, withdrew their troops, exposing entire sections, leading to the fall of the city to the Islamic Army of the Caucasus in the Battle of Baku.

A letter sent by Bagratuni to General Andranik, along with money to help defend against the invading Turks in Zangezur, dated 12 December 1918, states: "I send you one million rubles, of which 400,000 should be allocated to the military, and the remaining 600,000 for assistance to refugees - local and from distant places.

He was part of an Armenian military mission in August 1919 aimed at the United States for talks on cooperation in the defense sector.