On 15 February 1918, Haller questioned the agreements of the Treaty of Brest-Litovsk which reduced the chances for the creation of an independent Poland. Together with the II Brigade of the Polish Legions and the rest of Polish soldiers, Haller broke through the frontline near Rarańcza. and joined the Polish troops in Russia. He was ranked commander of a newly formed Polish 5th Siberian Rifle Division.