Understand Book of Daniel
Beginning of World War 3
Dan 11-40 "At the time of the end the king of the South shall attack him; and the king of the North shall come against him like a whirlwind, with chariots, horsemen, and with many ships; and he shall enter the countries, overwhelm them, and pass through."
As soon as the king of the South (Egypt supported by Saudi Arabia and the West) attacks Iran (king of the North), and Israel attacks the nuclear sites, the Antichrist leading Iran, Iraq and Syria (with demonic powers) will send their missiles, fighter jets, bombers, etc. to attack all Western Military bases in the middle East. Their numerous attack boats will target the 5th Fleet. This is the beginning of World War 3.
Dan 11:30 "For ships from Chittim (Western nations) shall come against him; therefore he shall be grieved, and return in rage against the holy covenant, and do damage. So he shall return and show regard for those who forsake the holy covenant."
The US 5th Fleet stationed in the Arabian Sea will immediately send their missiles, bombers, fighter jets, etc. to attack Iran to protect their military bases. The crafty Antichrist with Satanic powers will divert all their enemies' missiles and bombs to populated cities killing hundreds of thousands of his own Iranian civilians. The whole world will blame and hate the West for targetting and killing so many innocent Muslim civilians. These will deceive all Muslim nations, Russia, China, India, and many other nations to right the wrong by fighting along Iran extending WW3.
The Antichrist will then call 'Jihad' against Christians (holy covenant) and the West. Muslims living in the West will be so devastated that they will sabotage and destroy their adopted countries. Military bases, arsenal and weaponry, power stations, storages, factories, businesses, ships, hospitals, high rise buildings, transportation, cars, individuals, and everything in sight will be targets. With the West in self destruct at mode, the Antichrist with powerful allies will easily conquer all the neighbouring nations.
World War 3 in Matthew 24
Mat 24:6-7a "And you will hear of wars and rumors of wars. See that you are not troubled; for all these things must come to pass, but the end is not yet. For nation will rise against nation, and kingdom against kingdom."
Rumours of wars will come true and become wars. Rumours have been abound for many years that Israel will attack Iran's nuclear sites. Iran had declared that the first nuclear bomb will be used to annihilate Israel and the 2nd to annihilate Saudi Arabia. These wars will be intense and extensive (worldwide) that it will be like the end of the world _(but end is not yet)_. This definitely is World War 3.
World War 3 in 4th Seal
Rev 6:6-7 When He opened the fourth seal, I heard the voice of the fourth living creature saying, "Come and see." So I looked, and behold, a pale horse. And the name of him who sat on it was Death, and Hades followed with him. And power was given to them over a fourth of the earth, to kill with sword, with hunger, with death, and by the beasts of the earth.
With first 3 Seals fulfilled, we are expecting the 4th Seal, where 1/4 of all man will be killed by wars, hunger, pestilences, starving animals, etc. This must be World War 3.
So this 'Endtime War' in Dan 11, Mat 24:6-7, and the 4th Seal is the same 'World War 3, the last war before Rapture, when everyone will be living in peace and security (as found in 1Thess 5:1-4).