In 1914, upon the outbreak of the First World War, Blasich was inducted into the Austro-Hungarian army alongside Zanella, and was sent to the Eastern Front.
His request was granted and upon arrival in Italy, he was enlisted with the rank of Captain Doctor, fighting for the duration of the war on the front line.
After the Treaty of Rapallo on 12 November 1920, which established the Free State of Fiume in Rijeka, Blasich became the deputy to the Constituent Assembly and the Minister of the Interior of the Zanella Government, formed in October of that year.
After the annexation of Fiume to Italy and the Treaty of Rome signed on 27 January 1924, almost all members of the Constituent Assembly in exile (except Zanella) returned to the city, and Blasich resumed his medical profession.
On 3 May 1945 and in the days immediately following his death, other separatist leaders, such as Giuseppe Sincich and Nevio Skull,[5] were also murdered in the Fiume Autonomists purge.