In #4, what's a field cashier?
Field Cashier. He would be the person who gave the men money, when they wanted to draw it out. The order page gives his hours of attendance and the place, day and time.
by cyngast moderator
This link explains a bit about the First World War field cashiers: https://books.google.com/books?id=VU8TDQAAQBAJ&pg=PT232&lpg=PT232&dq=what+is+the+job+of+a+field+cashier+in+the+army&source=bl&ots=O2_SyssJgn&sig=cuaVPcmpNte24eUYdb56GLOfb6I&hl=en&sa=X&ved=0ahUKEwjgtryNzezPAhXJv1QKHRPXASgQ6AEIUzAJ#v=onepage&q=what is the job of a field cashier in the army&f=false
You may have to scroll up a bit to get the start of the section on pay in the field.
I've seen in some diaries of smaller units, like field ambulances, where the C.O. went to the field cashier himself, or his adjutant did, and drew out the pay for the men in his unit. There would then be a pay parade when the men actually got their cash.