My Friend, how would you describe a silhouette of a plane flying high up in the sky against references from the time of John nearly 2,000 years ago. I think that the silhouette of a frog jumping stretched out in full flight from one branch to another, in John's era, when viewed from below would match the silhouette of a commercial passenger plane of today's era reasonably accurately.
The description of the Euphrates River drying up is representative of the demise of the Baal worship that came out of Babylon, and as we are told that three of the ten horns, i.e. religions, of the fourth beast of Daniel 7:1-12.
The three kings mentioned in this Bowl Judgement are Satan, the Beast and the False Prophet and the demise of the "Baal" religion has meant that the way of these kings, i.e. another religious horn could rise up so that these three kings could come from the east when they are released from the Bottomless pit after a 1,000-year imprisonment.
Now in the Seventh Bowl judgement, it speaks of the hail that falls down from heaven like a plague. An apt description of modern warfare of Bombs and artillery shell falling down on people in the cities sheltering in Bomb shelters and in the trenches where the troops often sheltered in holes dug in the ground adjacent to their trenches.
The painted word pictures in the book of Revelation do describe warfare in our era. Jerusalem was taken by a charge of the Australian Light Horse charging the Turkish gun batteries in WW1.
We really need eyes to see and ears to hear to be able to visualise God's Prophetic word.
Your claim that planes and tanks are not described in the Bible, but the Roman army's tactic of using shields to protect them from arrows while they advanced is very similar to the modern-day troop carriers.
The Sixth Bowl Judgement spans many years from the time that the religions represented by the Euphrates River drying up, up and until the time that the Kings of the Earth are assembled at Armageddon to be judged and punished for their deeds against God's Sanctuary and His earthly Hosts. It is my belief that the events around the assembling of the kings of the earth at Armageddon is still a near future event that will occur at the time of the transition from this present age to the next age, in around 20-25 years' time.
This is also the time that Israel will be gather unto the Lord God and when God will fulfil His Promise in: -
Ezekiel 34:28: - 28 And they shall no longer be a prey for the nations, nor shall beasts of the land/earth devour them; but they shall dwell safely, and no one shall make them afraid.
The beasts of the earth described in the above verse are the three kings from the east, mention in Revelation 16:12-16 who will be imprisoned, (Isaiah 24:21-22), in a pit for many days to await the time of their punishment.
The Prophecies in the Book of Revelation lines up with the prophecies found in the Old Testament.