[2] In 1916, at the beginning of the Romanian campaign of World War I, Mociulschi was in command of the 10th Company of the 29th Infantry Regiment (Dorohoi), holding the rank of lieutenant.

At the beginning of July 1941, Mociulschi participated in Operation München, engaging Red Army forces in Northern Bukovina, in the Cernăuți area.

[2] On 12 August 1948 he was arrested by the Communist authorities in Codlea and sent without trial to penal colonies at the Danube–Black Sea Canal (Castelu), Onești,[3]: 24  and Târgu Ocna.

Founded in January 1940 and initially located in Baia Sprie, it is now based in Predeal and subordinated to the 2nd Mountain Troops Brigade that Mociulschi once commanded.

[4] Leonard Mociulschi was the commander of the Romanian troops (6th and 11th Vânători de munte battalions) that entered on 24 September 1944 the village of Ginta (Hungarian: Gyanta).

[5][6] Located in Southern Transylvania after the Second Vienna Award, Ginta had been occupied shortly by Hungarian forces[7] when, on 23 September 1944 a Romanian soldier was shot out of a window in the village.

[5][6] The Romanian Captain Teodor Brîndea,[7] (spelled as Bridea or Bride by different sources)[6] another officer and a soldier with a machine gun gathered the people from the streets, their yards and houses, took them to the edge of the village and executed them.

[5] Two days after the massacre the Romanian Army did not give the dead a proper burial and instead dumped the bodies of the villagers in a mass grave.

[6][5] He recalled that a local Romanian doctor, Augustin Pop, hid him and his then-seven-year-old sister in a dark room, and they were asked by their mother not to make any noise.