7 But when you only want to gather the people together (not to break camp), simply blow the normal sound.
There are several patterns of trumpet sounds for various purposes; they are distinguished by the length of the blast and the amount of separation between sounds.
8 Aaron’s people, the priests, shall blow them; this is a decree of peace for all generations to come. 9 There will be times, when you’re living in the land I’ve promised to you, that you’ll need to fight against people who oppress you. Use the trumpets to sound an alarm. Your God, the Eternal, will remember you, and you will be saved from such enemies.