Following the defeat of the Axis powers and the evacuation of the Nazi occupation forces many members of the Ohrana joined the SNOF where they could still pursue their goal of secession. The advance of the Red Army into Bulgaria in September 1944, the withdrawal of the German armed forces from Greece in October, meant that the Bulgarian Army had to withdraw from Greek Macedonia and Thrace. A large proportion of Bulgarians and Slavic speakers emigrated there. In 1944 the declarations of Bulgarian nationality were estimated by the Greek authorities, on the basis of monthly returns, to have reached 16,000 in the districts of German-occupied Greek Macedonia, but according to British sources, declarations of Bulgarian nationality throughout Western Macedonia reached 23,000.