What does Numbers 21:34 mean?

But God told Moses, 'Don’t be afraid of him. I’m handing him, his whole army, and his land over to you. Do to him what you did to Sihon, king of the Amorites, who ruled in Heshbon.' Numbers 21:34 - Modern Text Bible

(God reassures Moses that Og will be defeated just like Sihon, promising victory and the land.)