"They blew him all to bits." (4.83)
That’s typical Modernist language Catherine is using. World War I "blew up" the idea that the world was a safe place, and the Modernists were obsessed with fragments and pieces and breaking in general.
Stretcher bearers came in all the time, put their stretcher down, unloaded them and went away. (9.137)
There is a somber rhythm to Hemingway’s description of this procession of wounded men. And it presents a striking and vivid image of the war.
"And the ones who would not make war? Can they stop it?" "I do not know." (11.53, 54)
This is a rather meta-fictional moment. Hemingway’s novel is often seen as a protest against war, and the sentence expresses doubt over whether such protest can really help stop it.