1 Samuel 17:52-54

(52) And the men of Israel and of Judah arose, and shouted, and pursued the Philistines, until thou come to the valley, and to the gates of Ekron. And the wounded of the Philistines fell down by the way to Shaaraim, even unto Gath, and unto Ekron. (53) And the children of Israel returned from chasing after the Philistines, and they spoiled their tents. (54) And David took the head of the Philistine, and brought it to Jerusalem; but he put his armour in his tent.

The event of this victory over Goliath, was, as might have been expected. The Philistines fled, and Israel pursued. But this was not fair as was agreed upon. Goliath had promised for his countrymen, that if any man could be found to conquer him, the Philistines would then be the servants of Israel. But now this is done, they flee. In the Lord Jesus's victory, however, which this typified, the conquest will be altogether final and complete. The Devil, that deceived the world, will be cast into the lake of fire and brimstone, and the torment will be forever and ever. See Revelation 20:10, etc.