Numbers 24:18

24:18 Edom will be a possession,

Seir, ¹  his enemies, will also be a possession;

but Israel will act valiantly.

Numbers 31:14

The Death of the Midianite Women

31:14 But Moses was furious with the officers of the army, the commanders over thousands and commanders over hundreds, who had come from service in the war.

[24:18]  ¹ sn Seir is the chief mountain range of Edom (Deut 33:2), and so the reference here is to the general area of Edom.