Positions of the Bulgarian troops in Belasitsa Mountain / World War I

This is the back of F73k_op1_ae2801_v078. Text with ink: The Bridge over the Vardar River near the town of Gevgeli. 3 Infantry Macedonian Regiment. 12,5 x 8,5cm. Bulgarian language. Paper. Postcard. Original reference: BOX3; F73k_op1_ae2801_r078.