1. Why are soldiers “not as other men” according to Keegan?

It is because the way of life of the soldier can never be that of civilization itself.

Explanation:

War is entirely not normal for discretion or governmental issues since it should be battled by men whose qualities and aptitudes are not those of legislators or representatives. They are those of a world separated, an extremely old world, which exists in corresponding with the ordinary world yet doesn't have a place with it. The two universes change after some time, and the hero world adjusts in sync to the non military personnel. It follows it, nonetheless, a good ways off. All civilizations owe their beginnings to the soldier; their societies sustain the champions who shield them.

i think it was because of how protected egyptian civilization was was which allowed them to evolve without much outside influence.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain