And he gathered an host
A large army; for after the battle with the Ammonites he disbanded his army, and sent them home, retaining only 3000 men, and these deserted him to six hundred, which were all the men he had with him, when he fought last with the Philistines; but now, finding he had enemies on every side of him, he gathered a numerous host to defend his country against them, and particularly to attack the people next mentioned:
and he smote the Amalekites;
a people that Israel, by the law of God, were bound to destroy, and blot out their name; a particular account of his expedition against them is given in the following chapter:
and delivered Israel out of the hands of them that spoiled
the nations before mentioned, Moabites, Ammonites, Edomites, Syrians, and Philistines.