NA547 95R. Sergeant w/whistle"

           The 95th Rifles used whistles to communicate commands and signals as a  loud and distinct alternative to shouting over the din and confusion of the battlefield.
          Specific whistle signals such as “halt” or “Alarm Close” were used to command or attract the men’s attention and have them close ranks.  Both officers and non-commissioned officers used their whistles frequently to issue other instructions and warnings.
          Occasionally, sentries would also utilize whistles to alert their comrades in the event of trouble.