From 1464 to 1461, Otto fought on the side of Hesse in the Hesse-Paderborn Feud against bishop Simon III of Paderborn.
Troops from Padernborn had devastated Waldeck and in retaliation, Otto took the town of Lichtenau, looted it and took a number of prisoners.
Simon III again called in the help of his brother Bernard VII, who marched into Waldeck and besieged the town of Mengeringhausen.
In the same year 1475, Otto IV found himself in a feud against John I of Rietberg and his allies, who invaded Waldeck and captured the small town of Rhoden (now part of Diemelstadt) and took away prisoners and cattle.
Otto IV allied himself with the town of Korbach and on Whit Monday 1476, he attacked Erwitte and neighbouring villages and returned home with considerable spoils.
Waldeck-Landau was divided between the two surviving lines, Philip II of Waldeck-Waldeck and Henry VIII of Waldeck-Wildungen.