They (the great multitude) were saved by trusting the Lord Jesus. In their psalm (song) they celebrate their salvation and attribute it to their God and to the Lamb, and they thanked God for His gift.
Book Of Revelation, Blood Of The Lamb, Great Multitude, Living Fountains, Wipe Away All Tears
The Dragon Wars is a sermon dealing with Revelation chapter 12. The first war is against Israel and the Messiah The second war is against heaven, and the third war is against believers. It also addresses a believer's victory over Satan.
Satan, War In Heaven, The Dragon, Blood Of The Lamb