John Gill Bible Commentary

So the people took victuals in their hands and their trumpets,.... That is, the three hundred took victuals of those that departed, as much as was necessary for them, and also their trumpets, being directed thereunto by Gideon, no doubt; perhaps they took all the trumpets they had; however, as many as would furnish every man with one. And from hence it appears, that these three hundred that were ordered to stay and go with Gideon were unarmed men, at least could carry no arms in their hands; for in one hand they carried their victuals, and in the other hand their trumpets, so that the salvation wrought by them would most clearly appear to be of the Lord: and he sent all the rest of Israel every man unto his tent; not to his tent in the army, but to his own house, in the tribe and city to which he belonged: and retained these three hundred men; that had lapped water, to engage with the Midianites and their associates: and the host of Midian was beneath him in the valley; in the valley of Jezreel; for it seems as if Gideon, after he had brought down his men to the water to be tried, went up to the hill again with his three hundred men only, to wait the divine orders, when he should attack the army of Midian below him.