16 So the One seated on the cloud swung His sickle over the earth, and the earth was harvested.
The angel seized those who have rejected Jesus Christ and cast them into God’s wrath.
17 Then another angel who also had a sharp sickle came out of the sanctuary in heaven.
It seems that this angel came to help the other one seated on the cloud to gather the people and make them ready for judgment.
18 Yet another angel, who had authority over fire, came from the altar, and he called with a loud voice to the one who had the sharp sickle, “Use your sharp sickle and gather the clusters of grapes from earth’s vineyard, because its grapes have ripened.”
The phrase “Yet another angel, who had authority over fire” most likely refers to the angel mentioned in Revelation 16:8 which will bring a plague upon those who dwell on the earth by making them burn, causing the sun to get extremely hot.
The angel with the authority over fire, tells the other angels that it is time to gather the clusters of grapes which refer to the disobedient. Their sin has come to its full capacity and now they will answer for it (Joel 3:13).
19 So the angel swung his sickle toward earth and gathered the grapes from earth’s vineyard, and he threw them into the great winepress of God’s wrath.
This passage could refer to bringing the nation’s army against Israel so that the Lord can judge them and wipe them out (Ezekiel 38:1-9, 14-16, 18-22).
20 Then the press was trampled outside the city, and blood flowed out of the press up to the horses’ bridles for about 180 miles.
“Then the press was trampled outside the city” this will take place outside of Jerusalem.
The 180 miles give a clear indication that it will be an immense army that will come against the Jewish people to wipe them out of the face of the earth if it is referring to Gog. But nonetheless, whichever army or nation(s), it makes it very clear that many people who attempt to go against the Living God will pay for it with their lives.
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Spiritual Minefield 
Good stuff brother
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Thank you
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=)
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