Defeated the giant kingdom of Bashan

Deuteronomy 3;1-11
Same as did to Sihon king og the Amorites, the Load said to Moses "Do not be afraid of Bashan and Og king of Bashan.
The Load our God also gave into our hands Og king of Bashan and all his army. Israelite stuck them down , leaving no survivors. They took all 60 cities and all the livestock and many plunder from their cities.
Og king of Bashan was left of the remnant of the Rephaites,. His bed was made of iron and was more than 4 meters long and 1.5 meters wide.
Why?
Israelite defeated the giant men of Bashan whom their forefather afraid.
This victory gave Israel more faith and confidence.