In 1430 King Sigismund summoned the nobles of the Holy Roman Empire to a Reichstag in the city of Nuremberg and Oswald with his brother Michael immediately left Tyrol to meet the King, who instead of going directly to Nuremberg undertook a two-month detour to the South German cities of Überlingen and Constance to celebrate Christmas. During this period, Oswald wrote many songs of an erotic nature, the most famous being "Ain Graserin" (KL 76) about a bathing maid, whose "frizzy hair" between her legs leads a man to have sex with her on the spot. In Nuremberg, Oswald became a member of the first rank of the Order of the Dragon, a rank King Sigismund awarded only to two dozen nobles. Along with the honor came the obligation to participate in Sigismund's disastrous expedition against the Hussites in Bohemia in 1431. Oswald experienced firsthand the mass flight of the 130,000-strong Imperial army on August 14, 1431, when the entire army panicked after sighting the 50,000-strong Hussite army approaching and singing.