What does Deuteronomy 2:24 mean?

‘Get up and get moving. Cross the Arnon Valley. I’m handing over Sihon the Amorite, king of Heshbon, and his land to you. Start taking it over and go to war with him. Deuteronomy 2:24 - Modern Text Bible

(God now gives Israel the green light to confront Sihon and take his land.)