Extracts and comments from Revelation Chp. 12:9(a) & 12(c)
And the (a)great dragon was cast down, the ancient serpent, called the Devil (slanderer) and Satan (adversary) the one deceiving the whole world; he was cast out into the Earth, and his angels were cast out with him.
(a) Until this moment described, Satan had place in Heaven, despite his rebellion against God, his evil, and his constant attempts to subvert Heavenly creation to his side. Also, he constantly attempts to accuse, discredit and latterly destroy Israel. In the book of Job, Satan is shown to be free to patrol the Earth, and with the permit of God, do his best to destroy faith in God on Earth. In V.8, he no longer has free access to God, is cast to Earth, and as we see in Revelation, regarding Israel (and many God revering people) is allowed a short time of open direct tyranny, with no attempt at pretence in the 3½ years of Israel's extreme persecution (see V.12).
Therefore (a)rejoice ye Heavens, and ye that dwell in them. (b)Woe to the ones dwelling on the Earth, and in the sea, because the devil is come down to you having (c)great anger, knowing he has only a little time".
(c) Satan's Heavenly banishment leaves him with less room for manoeuvre, and activity. His success in Heaven has clearly been great, but the worthiness of The Lamb, allowed the releasing of the 7th seal, triggering the banishment in the timing of Jehovah Zebaoth. Satan had recruited / converted Angelic help for many reasons, all of which are to attempt to thwart the plan of Salvation of God Almighty and to magnify himself. The first example produced the Scripture recorded result of Nephilim, (Gen. 6) which had it succeeded would have brought to nothing the promise of God in Eden (Gen. 3:15), however, God intervened at the crucial stage to rid Earth of Nephilim, and save the pure line of Noah, and preserve His prophecies and promises.
The situation on Earth at the time of Satan's Heavenly expulsion is dire for the Jews, as the "man of sin", has broken his Covenant with Israel after 3½ years, and is imposing a brutal regime. This man often called "Antichrist", is now newly empowered by Satan, now located in Pergamos (Rev. 2:12-13), which interestingly is the location that the Babylonian priesthood removed to at the fall of Babylon many centuries earlier. Satan must still attempt to achieve the goal of stopping the promises of Jehovah Zebaoth regarding His people Israel from coming to fruition. He now releases his full wrath onto the ancient people of God, Israel.
See: Satan's Demise!