Little has been recorded regarding his early years in The Great War from what I have found he transferred from ground forces to the bombing unit Kagohl 6. When the four of the Kagohls were disbanded and reformed as 24 Schutzstaffeln, he requested transfer to a fighter unit, being placed at Jasta 26 on July 1917.
One must assume he had pilot experience as he shot down an observation balloon near Vlamertinghe on August 12th 1917 to start his victory string. He promptly went on to score on the 17th, and again on the 21st. By September’s end he became an ace.
October he saw 5 more victories to bring his count to ten on the 17th.
On the 18th, Dannhuber took a bullet through his upper arm while being shot down, which removed Dannhuber from action until 7 November.
On February 11th, 1918, he was severely injured when he crashed a Pfalz D.IIIa during a test flight at Thugny airfield.
The only award I see listed for him is the Cross of the Royal House Order of Hohenzollern.