sentences:  In 1914 he joined the Danish Army, not as a medical officer but as a recruit, and was promoted to Second Lieutenant in The Royal Life Guards a year later.Carl Krebs worked for the Danish Red Cross and the Danish Foreign Ministry in Russia from 1916 to 1920 monitoring conditions in Russian POW camps.While there, he participated in an expedition to Central Asia (Mongolia and Tannu Uriankhai), and in February 1918 was sent on a secret aid mission to Maria Feodorovna (Dagmar of Denmark) in Crimea, mother of the last Russian monarch, Emperor Nicholas II.