Whats the central topic of "give me shelter" and provide awe for that central topic

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,

i'm pretty sure i had this question the other day and b was the right answer.

can you give me a hint