Air raids

[543], Wt. 9854-34 G. H.,Text: In the event of a raid alarm by Maroon the Head Messenger should immediately blow his whistle and then proceed to close the hall door and unlock the exits in the basement. He should remain on duty in the front hall and endeavour to prevent any member of the staff leaving the building whilst the raid is in progress.,MU: Broadside is encapsulated.,Broadside giving instructions for to be taken following a Maroon alarm. A maroon is an exploding firework that creates a loud bang to act as a signal or warning. In the First World War, they were used in London to warn of imminent air raids. (Book Drum web site notes on Rebecca by Daphne du Maurier.)