In 1336, at the death of his uncle, Louis IV, Count of Loon and Chiny, Arnold laid claim to the estates, but without success.
Finally, on January 25, 1362, he bought the rights to the counties from his cousin Godfrey, Count of Looz and Chiny.
On December 25, Arnold approached the Emperor Charles IV for his help in financing the reconquest of Looz, but he failed in that endeavor.
On September 23, 1366, he entered into a transaction with John of Arkel, Prince-Bishop of Liège, receiving some financial compensation for the occupation of the counties In 1346, Arnold married Elizabeth of Flanders, illegitimate daughter of Louis of Flanders, Count of Nevers.
Arlette Laret-Kayser, Entre Bar et Luxembourg : Le Comté de Chiny des Origines à 1300, Bruxelles (éditions du Crédit Communal, Collection Histoire, série in-8°, n° 72), 1986