Unsealed Alien Files – February 6, 1942 UFO Battle of Los Angeles – Who invaded our skies that night?  This is fascinating…An underwater UFO base right off of Redondo Beach?
Here is an excerpt from the front pages on that day:

Los Angeles Times February 26th, 1942-front page:
Army Says Alarm Real
Roaring Guns Mark Blackout

Identity of Aircraft Veiled in Mystery; No Bombs Dropped and
No Enemy Craft Hit; Civilians Reports Seeing Planes and Balloon

Overshadowing a nation-wide maelstrom of rumors and conflicting reports, the
Army’s Western Defense Command insisted that Los Angeles’ early morning blackout
and anti-aircraft action were the result of unidentified aircraft sighted over the
beach area. In two official statements, issued while Secretary of the Navy Knox in
Washington was attributing the activity to a false alarm and “jittery nerves,” the
command in San Francisco confirmed and reconfirmed the presence over the Southland
of unidentified planes. Relayed by the Southern California sector office in
Pasadena, the second statement read: “The aircraft which caused the blackout in the
Los Angeles area for several hours this a.m. have not been identified.” Insistence
from official quarters that the alarm was real came as hundreds of thousands of
citizens who heard and saw the activity spread countless varying stories of the
episode. The spectacular anti-aircraft barrage came after the 14th Interceptor
Command ordered the blackout when strange craft were reported over the coastline.
Powerful searchlights from countless stations stabbed the sky with brilliant probing
fingers while anti-aircraft batteries dotted the heavens with beautiful, if sinister,
orange bursts of shrapnel.

City Blacked Out For Hours

The city was blacked out from 2:25 to 7:21 am after an earlier yellow alert at 7:18 pm
was called off at 10:23 pm. The blackout was in effect from here to the Mexican border
and inland to the San Joaquin Valley. No bombs were dropped and no airplanes shot down
and, miraculously in terms of the tons of missiles hurled aloft, only two persons were
reported wounded by falling shell fragments. Countless thousands of Southland residents,
many of whom were late to work because of the traffic tie-up during the blackout, rubbed
their eyes sleepily yesterday and agreed that regardless of the question of how “real”
the air raid alarm may have been, it was “a great show” and “well worth losing a few
hours’ sleep.” The blackout was not without its casualties, however. A State Guardsman
died of a heart attack while driving an ammunition truck, heart failure also accounted
for the death of an air raid warden on duty, a woman was killed in a car-truck collision
in Arcadia, and a Long Beach policeman was killed in a traffic crash enroute to duty.
Much of the firing appeared to come from the vicinity of aircraft plants along the
coastal area of Santa Monica, Inglewood, Southwest Los Angeles, and Long Beach.

Source: Los Angeles Times archives