The men of Israel and of Judah arose, and shouted, and pursued the Philistines, until you come to Gai, and to the gates of Ekron. The wounded of the Philistines fell down by the way to Shaaraim, even to Gath, and to Ekron.
In applying this story, I believe it is legitimate to see Goliath as representing the many enemies that frustrate individual believers as we seek to live for God. However, I believe primarily the application deals with defeating those enemies bent on defeating and destroying God’s people en masse. Contemporary movements designed to discredit God and remove Christianity from a land are what Goliath personifies.