Diḇre haYamim Aleph (1 Chronicles) 20:1

And it came to be at the turn of the year, at the time sovereigns go out to battle, that Yo’aḇ led out the power of the army and destroyed the land of the children of Ammon, and came and besieged Rabbah. But Dawiḏ remained at Yerushalayim. And Yo’aḇ struck Rabbah and overthrew it.