A stupid little question, but necessary for me to understand this completely: what does the word "awe" mean?

Dear Mariska
 

Main Entry: awe

Pronunciation: 'o

Function: noun

Etymology: Middle English, from Old Norse agi; akin to Old English ege awe, Greek achos pain

1 : an emotion variously combining dread, veneration, and wonder that is inspired by authority or by the sacred or sublime <stood in awe of the king> <regard nature's wonders with awe>

2 archaic a : DREAD, TERROR b : the power to inspire dread

Ty to m-w.com.

That's definitely it, then. He's amazed, shocked, and somewhat fearful at the sheer size of the army and at what he has done. Awe describes it perfectly.