Charles H. Spurgeon on Psalms 20:5

"In the name of our God we will set up our banners." The banners formerly so much used were a part of military equipage, borne in times of war to assemble, direct, distinguish, and encourage the troops. They might possibly be used for other purposes also. Occasions of joy, splendid processions, and especially a royal habitation, might severally be distinguished in this way. The words of the psalmist may perhaps be wholly figurative: but if they should be literally understood, the allusion of erecting a banner in the name of the Lord, acknowledging his glory, and imploring his favour, might be justified from an existing practice. Certain it is that we find this custom prevalent on this very principle in other places, into which it might originally have been introduced from Judea. Thus Mr. Turner (Embassy to Thibet, p. 31), says, "I was told that it was a custom with the Soobah to ascend the hill every month, when he sets up a white flag, and performs some religious ceremonies, to conciliate the favour of a dewata, or invisible being, the genius of the place, who is said to hover about the summit, dispensing at his will, good and evil to every thing around him. —Samuel Burder's "Oriental Customs," 1812.