This verse already speaks in advance of the victory that the Lord gives as an answer to prayer. That is why people wave their banners. In the last part of this verse, the Lord is asked (as a summary of the previous verses) to fulfill all the king’s wishes.
6 Nous nous réjouirons de ton salut,Nous lèverons l'étendard au nom de notre Dieu;L'Eternel exaucera tous tes vœux.