After the dissolution of the Austro–Hungarian monarchy, following its defeat in the war, Salis-Seewis settled in Croatia where he got involved with the Croatian fascist Ustaše.

After the failure of the campaign and the retreat of Austro-Hungarian forces out of Serbia, Salis-Seewis was redeployed with the 42nd division to Galicia and the Carpathian Front, he received the rank of Lieutenant field marshal in February 1915.

[6] Following suspicions then complaints from the Hungarian authorities that Salis-Seewis supported the annexation idea of incorporating Serbia into the Empire, he was dismissed of his function in July 1916 and replaced by his former corps commander, General der Infanterie Adolf von Rhemen.

Generalkommando Rumänien (Supreme Command of the Armed Forces of Romania) under General August von Mackensen, the German military governor of occupied Roumania.

Following the defeat of Austria-Hungary and the Central Powers, he moved to Croatia where the government of the new Kingdom of the Serbs, Croats, and Slovenes allowed him to settle and gave him a state pension.