The poem snow fall is my favorite. which is the appositive?

1.the hosts on two opposing mountains stood,  

2.thick as the foliage of the waving wood;  

3.between them an extensive valley lay,  

4.o'er which the gleaming armour pour'd the day,  

5.when from the camp of the philistine foes,

6. dreadful to view, a mighty warrior rose; in the dire deeds of bleeding battle skill'd,

the switch in narration increases the proximity of the narrator to the main character and the reader can perceive information only through the filter of a single character.