shell shocked

[Mullins, Bill]

 OED has 1918

The Times (of London), Tuesday, Jul 25, 1916; [dateline July 22] pg. 7;
Issue 41228; col C
     The Thin Line At Longueval. Heroic Story., Charge Of Battle-Worn
Troops., Valiant Scots And South Africans. (From Our Special
Correspondent.).

"Shell-shocked and wounded, sound or hurt, these men, who had had four
sleepless days and nights of continous effort and fighting, somehow went
forward."