For examples of the employment of trumpets in war compare marginal references and 2 Chronicles 20:28. By employment of them was signified the dependence of God's people on His aid.

If ye go to war - These trumpets shall be sounded for the purpose of collecting the people together, to deliberate about the war, and to implore the protection of God against their enemies.

Ye shall be remembered before the Lord - When ye decamp, encamp, make war, and hold religious festivals, according to his appointment, which appointment shall be signified to you by the priests, who at the command of God, for such purposes, shall blow the trumpets, then ye may expect both the presence and blessing of Jehovah in all that ye undertake.

And when ye go to war in your land against the enemy that oppresseth you,.... That enters in to invade it, to besiege cities, and distress the inhabitants of it:

then ye shall blow an alarm with the trumpets: a "tara-tan-tara" with both of them, to call the several tribes together to join against the enemy; or to call them to fasting and humiliation, to repentance and prayer, to seek the Lord in the exercise of these, and cry for help and assistance, for victory and salvation; for, as Ben Gersom observes, by this alarm their hearts would be broken and become contrite, and they would return to the Lord, and he would have mercy on them when they pray unto him; for such a sound makes a man's heart shake and tremble, according to Amos 3:6; see Jeremiah 4:19; this is a third use of the trumpets, and in a mystical sense it may be observed, that saints are in a militant state, and have many enemies that come in to them to oppress them, sin, Satan, and the world; and the Gospel calls and encourages them to fight, furnishes them with armour, and assures them of victory, and directs them where to fight and with whom, and bids them endure hardness as good soldiers of Christ:

and ye shall be remembered before the Lord your God; for a book of remembrance is written for them that fear God, humble themselves before him, and pray unto him:

and ye shall be saved from your enemies; as Israel from their temporal, so the people of God from their spiritual enemies, being made more than conquerors through him that loved them.

"If ye go to war in your land against the enemy who oppresses you, and ye blow the trumpets, ye shall bring yourselves to remembrance before Jehovah, and shall be saved (by Him) from your enemies." מלחמה בּוא, to come into war, or go to war, is to be distinguished from למּלחמה בּוא, to make ready for war, go out to battle (Numbers 31:21; Numbers 32:6).

And if ye go to war in your land against the enemy that oppresseth you, then ye shall blow an alarm with the trumpets; and ye shall be remembered before the LORD your God, and ye shall be saved from your enemies.

10:9 Ye shall be saved - If you use this ordinance of God with trust and dependance upon God for help.

9. If ye go to war-In the land of Canaan, either when attacked by foreign invaders or when they went to take possession according to the divine promise, "ye [that is, the priests] shall blow an alarm." This advice was accordingly acted upon (Nu 31:6; 2Ch 13:12); and in the circumstances it was an act of devout confidence in God. A solemn and religious act on the eve of a battle has often animated the hearts of those who felt they were engaged in a good and just cause; and so the blowing of the trumpet, being an ordinance of God, produced that effect on the minds of the Israelites. But more is meant by the words-namely, that God would, as it were, be aroused by the trumpet to bless with His presence and aid.

10:1-10 Here are directions concerning the public notices to be given the people by sound of trumpet. Their laws in every case were to be Divine, therefore, even in this matter Moses is directed. These trumpets typify the preached gospel. It sounds an alarm to sinners, calls them to repent, proclaims liberty to the captives and slaves of Satan, and collects the worshippers of God. It directs and encourages their heavenly journey; stirs them up to combat against the world and sin, encouraging them with the assurance of victory. It leads their attention to the sacrifice of Christ, and shows the Lord's presence for their protection. It is also necessary that the gospel trumpet give a distinct sound, according to the persons addressed, or the end proposed; whether to convince, humble, console, exhort, reprove, or teach. The sounding of the trumpet of the gospel is God's ordinance, and demands the attention of all to whom it is sent.