[Cross-posted at Society for Military History Blog.]
New York waited for an air raid in June 1918. For thirteen nights from 4 June, much of the city was blacked out to avoid giving German pilots any assistance in locating targets to bomb. The New York Times reported the following day that:
Electric signs and all lights, except street lamps and lights in dwellings, were out in this city last night in compliance with orders issued by Police Commissioner Enright at the suggestion of the War Department, as a precaution against a possible attack by aircraft from a German submarine. A system for signalling by sirens in case the approach of aircraft should be detected was devised by the police and signal officers yesterday to warn persons to get under cover.1
While coastal and anti-aircraft batteries readied their guns, aviators went up to check the effectiveness of the blackout, resulting in its extension. After the third night, it was reported that
The lower part of the city was in almost complete darkness, the number of street lights being reduced and those that burned being dimmer. Every downtown skyscraper was almost entirely dark, the shades in the rooms which were lighted being drawn.2
City officials met to discuss other civil defence measures, including air raid sirens and shelters. A particular concern was the evacuation of skyscrapers during business hours:
It was pointed out that in case of such a raid in the daytime the danger of loss of life from panic in swarming down the stairs and into elevators would be greater than the danger of bomb explosions.3
It was decided that the best thing to do would be to designate certain floors as evacuation points. These plans were probably not put into effect, however, as the last night of blackout was 16 June; on 17 June all police precincts were ordered to 'Resume normal lighting throughout the city until further orders'.4 There was evidently some embarrassment now, as the War Department and the New York Police Department each claimed that the blackout was the other's idea. In any event, the exercise doesn't seem to have been repeated.
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