He was awarded the Croix de Guerre in July 1923. The Foreign Legion is known for their eccentric commanders, in May 1924 he was given command of the mounted infantry company of the 2nd R.E.I. He saw combat action north of the border with Spanish Morocco. Here the Legion fought the Berber Riff leader Abd-el-Krim, who had raised the tribes against the Spanish. In 1924, Prince Aage was appointed to the staff of Marshall Lyautey as Intelligence Officer. In April 1925, Abd-el-Krim invaded French Morocco. Here the Prince participated in combat actions in the mountains. He served with the Legion in Morocco until his death in Taza, Morocco, 1940 and was buried in Sidi Bel Abbés, Algeria after serving with the legion for seventeen years. He had reached the rank of Lieutenant-Colonel.