“16 And he gathered them together into a place called in the Hebrew tongue Armageddon.” (Rev 16:16 KJV)
Armageddon is the hill of Megiddo. More specifically, here it’s referring to a great battlefield in Megiddo. Here Satan has gathered his troops to war against God and His people. This is the final battle of the tribulation period.
As a Thief
“Behold, I come as a thief. Blessed is he that watcheth, and keepeth his garments, lest he walk naked, and they see his shame.” (Rev 16:15 KJV)
This is the third blessing statement of the apocalypse. Jesus gives us one more warning that He is coming quickly and we do not know the time. To watch is to be ready spiritually. To keep garments, also ‘keep your robes white’, is metaphoric of living in holiness. Jesus is coming back for those that are watching for His coming and have kept their robes white. This echoes Jesus’ statement in Matthew.