I te tau 1917, i uru a Knauth ki te ope taua o Amerika i te tau 1917 ki te mahi i te Whare Taonga o Europi o te Pakanga Tuatahi o te Ao. I mahi a Knauth me te 101st Field Artillery Regiment o te New England Division o nga American Expeditionary Forces. I uru ia ki ngā pakanga o Chemin des Dames
, Te Pakanga o Saint-Mihiel, Pont-à-Mousson, me Château Thierry.