An experienced mechanic, Teichmann joined the army in 1915. Assigned to an infantry regiment, his pre-war skills were needed elsewhere and in February 1916 he was posted to Flik 5 on the Russian Front. In May 1917, he completed pilot training and was assigned to Flik 42J. After scoring three victories, he was reassigned to Flik 60J where he scored one more victory while serving under Frank Linke-Crawford. In August 1918, Teichmann scored his final victory after being reassigned to Flik 14J at Feltre.