I would interpret this asEnige tijd later verklaarden de legers van Moab, Ammon, en van de Meünieten koning Josafat en het volk van Juda de oorlog.
but is "aan" or some other preposition missing from the Dutch?Some time later the armies of Moab, Ammon, and of the Meunites declared war on King Jehoshaphat and the people of Judah.
Comes from https://www.bible.com/bible/75/2CH.20.HTB