From 1814 to 1819 his admirers were engaged in a long and angry controversy with Baggesen, who represented the old didactic school. This contest seems to have disturbed the peace of Oehlenschläger's mind and to have undermined his genius. His talent may be said to have culminated in the cycle of verse-romances called "Helge", published in 1814. The tragedy of "Hagbarth og Signe", (1815), showed a distinct diminution of his powers. In 1817 he returned to Paris, and published "Hroars Saga" and the tragedy of "Fostbrødrene". In 1818 he was again in Copenhagen, and wrote the idyll of "Den lille Hyrdedreng" and the Eddaic cycle called "Nordens Guder". His next productions were the tragedies of "Erik og Abel" (1820) and "Væringerne i Miklagaard" (1826), and the epic of "Hrolf Krake" (1829). His last volumes were "Tordenskjold" (1833), "Dronning Margrethe" (1833), "Sokrates" (1835), "Olaf den Hellige" (1836), "Knud den Store" (1838), "Dina" (1842), "Erik Glipping" (1843), and "Kiartan og Gudrun" (1847). After his death his "Recollections" (1850) were published in two volumes.