JWEBut+the+poor+dead+soldiers+of+King+George+They+neither+know+nor+care.

This sentence is talking about the english soldiers who went to war under the command of King George. It is saying that since they are dead they do not care about who won the war or what will happen in the world of the living. The author is trying to show how if you die in the war you no longer care about it. So when the poet say's "the poor dead soldiers of King George, They neither know nor care." that is exactly what he is talking about. If people could look at war from the view of those who have passed away they would find it meaningless.