How did a British soldier become a batman during WWI?

Was he assigned to a higher ranking solder? Was he chosen by a higher ranking soldier? Any and all information on batmen will be greatly appreciated. And please no Batman /\/\^--^/\/\ referencesHow did a British soldier become a batman during WWI?
NANANANANNANANANNA batman!How did a British soldier become a batman during WWI?
1 - not to a solider, but to an officer. Privates and NCO's didn't have batmen.
2- He could be picked and chosen by an officer, or simply be assigned to him.How did a British soldier become a batman during WWI?
That would be awesome

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