Joshua 5: 13 - 15: And it came to pass, when Joshua was by Jericho, that he lifted up his eyes and looked, and, behold, there stood a man over against him with his sword drawn in his hand: and Joshua went unto him, and said unto him, Art thou for us, or for our adversaries? And he said, Nay; but as captain of the host of the LORD am I now come. And Joshua fell on his face to the earth, and did worship, and said unto him, What saith my lord unto his servant? And the captain of the LORD'S host said unto Joshua, Loose thy shoe from off thy foot; for the place whereon thou standest is holy. And Joshua did so.
The new generation of Israel fought three major wars before entering the Promised Land; the first war was against Og of Bashan; the second war was against Sihon of the Amorites.
Between the second war (the sixth trumpet) and the third war (the destruction of Jericho; the seventh trumpet), the Captain of the Host (Christ Himself) descended to Joshua.
Between World War Two and World War Three (Armageddon), Christ (Revelation 10: 1) revealed Himself through a Gentile prophet (Revelation 10: 7).