On August 30, 1914 he started his service as junker of Yelizavetgrad Cavalry School. Having graduated the four month 1st-grade intensive course, he was appointed praporshchik and assigned to Azerbaijani reserve cavalry regiment of the Caucasian Native Mounted Division which was formed from Muslim volunteers from Caucasus and Transcaucasus. On June 14, 1915 Jamshid Khan was transferred to the regiment and on August 22 he was promoted to the rank of Cornet. On February 14, 1916 he was awarded with his first military award of Order of Saint Anna of 4th degree. On 26 January 1917 Jamshid Khan was decorated with St. George sword for defeating the enemy and leading a cavalry attack, despite being wounded twice. In March 1917, Jamshid Khan was awarded with Order of Saint Stanislaus of 2nd degree for his bravery on Romanian front. On April 15 he was awarded with Order of St. Anna of the 3rd degree and on August 22 with Cross of St. George of 4th degree. On October 30, 1917, Nakhchivanski was conferred the rank of stabs-rittmeister, and his regiment was made a part of the Russian Caucasus Army and relocated to the Caucasus. At the end of 1917, at Special Transcaucasian Committee orders, formation of Muslim Corps under Lieutenant General Ali-Agha Shikhlinski's command began.
After establishment of Soviet rule in Azerbaijan, Karabakh division was transferred under command of the Red Army. Following the suppression of the 1920 Ganja revolt, Bolsheviks arrested many Azerbaijani officers including Nakhchivanski. He was kept in prison on Nargin island in Baku Bay but was released in two months to serve in administration of Red Commanders School. He then served as Commander of Azerbaijani Rifle Division from 1921 to 1931. On February 22, 1931 he was called to Red Army corps in Tbilisi where he was arrested and accused of treason and anti-Soviet espionage. On September 30, 1931 he was sentenced to death but Sergo Ordzhonikidze prevented the execution by taking the issue to Politburo where Joseph Stalin ordered to release Nakhchivanski provided that he wouldn't work and live in Caucasus. Nakhchivanski was rehabilitated in the army and sent to Frunze Military Academy for further studies. In 1933, he completed his studies and stayed at the academy to teach military tactics. On December 5, 1935 by the order of People's Commissar of Defense Kliment Voroshilov he was conferred the rank of Combrig.
Death
During the Great Purge, Nakhchivanski was arrested on May 20, 1938 and was charged with anti-Soviet activities and espionage on August 26, 1938 in Lefortovo prison. He was sentenced to death and confiscation of all personal property. Nakhchivanski was executed by firing squad. His body was transported and buried in Kommunarka shooting ground, an NKVD burial site for repression victims, 26 km outside of Moscow. On December 22, 1956 he was rehabilitated. In 2007, 112th anniversary of Jamshid Nakhchivanski was celebrated in Azerbaijan. Streets in Baku and Nakhchivan as well as Jamshid Nakhchivanski Military Lyceum were named after Jamshid Khan Nakhchivanski. A house museum in Nakhchivan was also opened by Azerbaijani government.