Rev 12:11 And they overcame him by the blood of the Lamb, and by the word of their testimony; and they loved not their lives unto the death.
They, who spoke with one voice from heaven. The voices of the martyrs, who overcame death, hell and the devil by faith in the blood of the Lamb and the word of their testimony, the Word of God.
It (the blood) works because the death of Jesus on the cross as our substitute purchases us as God's personal property, and this makes us want to live unto God. "If anything can make a man holy it is a firm faith in the atoning sacrifice. When a man knows that Jesus died for him, he feels that he is not his own, but bought with a price, and therefore he must live unto him that died for him and rose again." (Spurgeon)
Rev 12:12 Therefore rejoice, ye heavens, and ye that dwell in them. Woe to the inhabiters of the earth and of the sea! for the devil is come down unto you, having great wrath, because he knoweth that he hath but a short time.
Rejoice, you who are in heaven, the departed saints and the angels, for satan is no longer given access to God. Woe to those on earth and of the sea! The devil is coming down, having great wrath. He is angry now, but will really be angry in the mid tribulation time.
Rev 12:13 And when the dragon saw that he was cast unto the earth, he persecuted the woman which brought forth the man child.
He will persecute the nation Israel, which brought forth the Christ child.
Rev 12:14 And to the woman were given two wings of a great eagle, that she might fly into the wilderness, into her place, where she is nourished for a time, and times, and half a time, from the face of the serpent.
Many would escape into the wilderness, perhaps like from Egypt, on the wings of an eagle. It would be God's deliverance, perhaps by the wings of an airplane?
Exo 19:4 Ye have seen what I did unto the Egyptians, and how I bare you on eagles' wings, and brought you unto myself.
This too points to the last half of Daniel's seventieth week. Satan has always persecuted the Jewish people, because they are God's people.
Rev 12:15 And the serpent cast out of his mouth water as a flood after the woman, that he might cause her to be carried away of the flood.
Rev 12:16 And the earth helped the woman, and the earth opened her mouth, and swallowed up the flood which the dragon cast out of his mouth.
Isa 59:19 So shall they fear the name of the LORD from the west, and his glory from the rising of the sun. When the enemy shall come in like a flood, the Spirit of the LORD shall lift up a standard against him.
Rev 12:17 And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ.
The remnant of Jews who believe in the Lord Jesus Christ, would be attacked by satan and there would be many killed.
Rev 7:9 After this I beheld, and, lo, a great multitude, which no man could number, of all nations, and kindreds, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands;
Rev 7:10 And cried with a loud voice, saying, Salvation to our God which sitteth upon the throne, and unto the Lamb.
Satan is angry at the Jews and those who trust in Jesus now. He is controlling the minds and hearts of many nations, even our own. He is making way for the coming lying savior, the antichrist, the man of (false) peace.