The soldier, Anthony Sherman, who wrote the original story claimed to be a first hand witness of the event. He could not have been: He was under Benedict Arnold's command in Saratoga at the time and did not join Washington's command until long after Valley Forge.
There is no 18th century corroboration of such a story, and there is no record that Washington ever wrote, spoke, or intimated to anyone publicly or privately about this so called "vision."
It is a complete fabrication.
Something momentous happened to him during that winter that he felt caused him to want to change the course of his life in a spiritual way.
The coming of the lawless one is according to the working of Satan, with all power, signs, and lying wonders, and with all unrighteous deception among those who perish, because they did not receive the love of the truth, that they might be saved. And for this reason God will send them strong delusion, that they should believe the lie, that they all may be condemned who did not believe the truth but had pleasure in unrighteousness.Satan's endgame is to deceive as many souls as he can, to hurt or destroy as many believers as he can. It is a great foolishness to enter such a time as this without being fully armed, both for offense, and for defense. Offense, in that we wield the sword of God's word in proclamation of the Gospel. Defense, in that we test the spirits, and maintain wariness against the enemy of our souls. No angelic being can ever trump the good old fashioned truths of Scripture:
(2 Thessalonians 2:9-12)
But even if we, or an angel from heaven, preach any other gospel to you than what we have preached to you, let him be accursed. As we have said before, so now I say again, if anyone preaches any other gospel to you than what you have received, let him be accursed.So getting the Gospel right is way more important than paying any heed to luminous persons in the sky. I have no doubt that the single worst thing we could do to seek God's blessing on this nation is to tempt God, as a nation, by raising yet another idol in our midst. Calling it a shrine does not lessen the offense. There is only one God for us to worship, and the only shrine he requires is that we worship Him in spirit and in truth.
(Galatians 1:8-9)