This is interesting:

The phenomenon that was the ‘angels of Mons’ was experienced by British troops retreating in the aftermath of the Battle of Mons on the Western Front in August 1914.

Numerous soldiers claimed to have seen visions in the sky of St. George surrounded by angels, horsemen and cavalry.

The visions, which were subsequently charitably attributed to the extreme tiredness of the British troops, most of whom had not slept in days, actually originated in a short story published by the journalist Arthur Machen (an author of occult fiction) in the London Evening News at the close of the month following the battle, entitled The Bowmen.