[2] At the start of World War II he was Operations Chief for the 2nd Mountain Division (Vânători de munte), under the command of General Ioan Dumitrache.

There, together with a fellow army officer, Toma Arnăuțoiu, he formed in December 1948 a group named "Haiducii Muscelului" (Romanian for "The Hajduks from Muscel").

[7] In 1950, the Pitești branch of the Securitate demonstratively executed, without trial, at Izvoarele, one of Arsenescu's aides, Traian Marinescu Geagu, a peasant student from Dâmbovița County.

[8] In the fall of 1951, Arsenescu was ambushed by the security forces while crossing Râul Târgului; badly wounded by gunfire, he managed to hide in the woods and found refuge in the home of Apostol Postoaca.

In February 1962 he was sentenced to death by the Bucharest Military Tribunal for "terrorist acts perpetrated as organizer of an armed group of anti-communist resistance", and was executed on May 29, 1962 at Jilava Prison.