Charles H. Spurgeon on Psalms 136:20

And Og the king of Bashan. He was of the race of the giants, but he was routed like a pygmy when he entered the lists with Israel's God. The Lord's people were called upon to fight against him, but it was God who won the victory. The fastnesses of Bashan were no defence against Jehovah. Og was soon ousted from his stronghold when the captain of the Lord's host led the war against him. He had to exchange his bedstead of iron for a bed in the dust, for he fell on the battle field.

Glory be to the divine conqueror, for his mercy endureth for ever.

Giant kings before him yield,

Mercy ever holds the field.

If Sihon could not turn the Lord from his purpose we may be sure that Og could not. He who delivers us out of one trouble will rescue us out of another, and fulfil all the good pleasure of his grace in us.