Through God we shall do valiantly: for he it is that shall tread down our enemies.

Through God we shall do valiantly; For he it is that will tread down our adversaries.

Through God we shall do mightily: and he shall bring to nothing them that afflict us.

In God we do mightily, And He treadeth down our adversaries!

Through God we will do great things, for through him our haters will be crushed under our feet.

Hast not Thou, O God, cast us off? And Thou goest not forth, O God, with our hosts.

Through God - By the help of God.
We shall do valiantly - literally, we shall make strength. That is, we shall gain or gather strength; we shall go forth with spirit and with courage to the war. This expresses the confident assurance that they would secure the aid of God, and that under him they would achieve the victory.
For he it is that shall tread down our enemies - He will himself tread or trample them down; that is, he will enable us to do it. The psalm, therefore, though begun in despondency and sadness, closes, as the Psalm often do, with confident hope; with the assurance of the favor of God; and with the firm belief that the object sought in the psalm would be obtained. The history shows that the prayer was answered; that the armies of David were successful; that Edom was subdued; and that thus the territories of the Hebrew people had, in fact, in the time of David, the boundaries promised to Abraham.

Through God we shall do valiantly - Through thee alone shall we do valiantly; thou alone canst tread down our enemies; and to thee alone we look for conquest.
The author to whom Harmer refers in the note on the fourth verse, is one of the writers in a work entitled Gesta dei per Francos, fol. Hanoviae, 1611, 2 vols. And the places quoted by Harmer may be found in vol. i., p. 282; and as the passage is singular, and a good use has been made of it for the illustration of a difficult passage, I shall lay the words of the original before the reader: "Proxima ab hinc die sabbati clarescente, quidam Sarracenorum spe vitae in summitatem tecti domus praecelsae Solomonis ab armis elapsi, circiter trecenti, confugerant. Qui multa prece pro vita flagitantes, in mortis articulo positi, nullius fiducia aut promissione audebant descendere, quousque vexillum Tankradi in signum protectionis vivendi susceperunt. Sed minime misellis profuit. Nam plurimis super hoc indignantibus, et Christianis furore commotis, ne unus quidem illorum evasit."
It is very properly added by Albertus, that the noble spirit of Tancred was filled with indignation at this most horrible breach of faith; and he was about to take a summary revenge on the instigators and perpetrators of this unprincipled butchery, when the chiefs interposed, and not only maintained the expediency of the massacre that had already been committed, but the necessity of putting all the inhabitants to the sword. On this the savage fiends, called Christians, flew to arms, and made a universal slaughter of all that remained of the inhabitants. They drew out the prisoners, chopped off their heads, stabbed all they met with in the streets, and-but I can translate no farther; it is too horrible. I shall give my author's words, who was an ecclesiastic, and wrote down the account from eye-witnesses: "Concilio hoc accepto, (the determination of the chiefs to put all to the sword), tertio die post victoriam egressa est sententia a majoribus: et ecce universi arma rapiunt, et miserabili caede in omne vulgus Gentilium, quod adhuc erat residuum, exsurgunt, alios producentes e vinculis et decollantes: alios per vicos et plateas civitatis inventos trucidantes, quibus antea causa pecuniae, aut humana pietate pepercerunt. Puellas vero, mulieres, matronas nobiles, et faetas cum puellis tenellis detruncabant, aut lapidibus obruebant, in nullis aliquam considerantes aetatem. E contra, puellae, mulieres, matronae, metu momentaneae mortis angustiatae et horrore gravissimae necis concussae Christianos in jugulum utriusque sexus debacchantes ac saevientes, medios pro liberanda vita amplexabantur, quaedam pedibus eorum advolvebantur, de vita et salute sua illos nimium miserando fletu et ejulatu solicitantes. Pueri vero quinquennes aut triennes matrum patrumque crudelem casum intuentes, una miserum clamorem et fletum multiplicabant. Sed frustra haec pietatis et misericordiae signa fiebant: nam Christiani sic neci totum laxaverunt animum, ut non lugens masculus aut faemina, nedum infans unius anni vivens, manum percussoris evaderet. Unde plateae totius civitatis Jerusalem corporibus extinctis virorum et mulierum, lacerisque membris infantium, adeo stratae et opertae fuisse referuntur, ut non solum in vicis, soliis et palatiis, sed etiam in locis desertae solitudinis copia occisorum reperiretur innumerabilis.'GestA Dei Vol. I., p. 283.
This is one specimen of the spirit of the crusaders, and is it any wonder that God did not shine on such villanous measures! No wonder that the Mohammedans have so long hated the name of Christian, when they had no other specimen of Christianity than what the conduct of these ferocious brutes exhibited; and these were called Gesta Dei, the transactions of God!
There are many difficulties in this Psalm; whether they are in general removed by the preceding notes, the reader must judge. The following analysis is constructed on the supposition that the Psalm speaks of the distracted state of the kingdom from the fatal battle of Gilboa, in which Saul fell, to the death of Ishbosheth, when the whole kingdom was united under David.

Through God we shall do valiantly,.... Or, "through the Word of the Lord", as the Targum; Christ, whose name is the Word of God, appearing at the head of his armies, in a vesture dipped in blood, and with a sharp sword proceeding out of his mouth, will inspire his people to fight valiantly under him; and who, in his name and strength, will get the victory over all their enemies, the beast, false prophets, and kings of the earth, and all under them; see Revelation 19:11;
for he it is that shall tread down our enemies; as mire in the street, or as grapes in a winepress; even kings, captains, mighty men, and all the antichristian nations and states; the beast, false prophet, and Satan himself, Revelation 19:15; and so there will be an end of all the enemies of Christ and his people; after which they will spend an endless eternity together, in joy, peace, and pleasure. The victory is wholly ascribed to God the Word; it is not they that shall do valiantly, that shall tread down their enemies; but he by whom they shall do valiantly shall do it; even the mighty "He", to whom was promised, in Eden's garden, the bruising the head of the serpent, and all enemies, Genesis 3:15; and who has the same name here as there.