Passage
So they struck down him and his sons and all his people, until there was no survivor remaining for him; and they possessed his land.
So they struck down him and his sons and all his people, until there was no survivor remaining for him; and they possessed his land.
Numbers 21:33 Then they turned and went up by the way of Bashan, and Og the king of Bashan went out to meet them, he and all his people for battle at Edrei.
Numbers 21:34 But Yahweh said to Moses, “Do not fear him, for I have given him into your hand, and all his people and his land; and you shall do to him as you did to Sihon, king of the Amorites, who lived at Heshbon.”
Numbers 21:35 So they struck down him and his sons and all his people, until there was no survivor remaining for him; and they possessed his land.
The verse centers on "struck", "down", "sons", "people", "until", "survivor", "remaining", and "possessed". It is saying that the verse draws attention to "struck" and "down", so its meaning should be read from those terms before moving to application.
The prior verse says "But Yahweh said to Moses Do not...", giving immediate footing for "struck" and "down". In Numbers context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "struck" and "down" with trust shaped by these words, not by a vague optimism outside the passage.