This is the last battle, called in Revelation 16:16 Armageddon. In the vision of the sixth bowl, the nations are gathered by the working of three unclean spirits coming from the mouth of the dragon, the beast and the false prophet.
We should not listen to the interpreters who have created two judgements: one for the lost, and another for believers just to allocate rewards. That is completely artificial, and poor exegesis of Scripture. There is only one judgement. Will believers go through it? ‘Yes,’ is one answer, ‘they will. We’ll all stand in judgement.’ You will stand in the Day of Judgement, but you will stand just to see what you have been forgiven. We will all catch a comprehensive glimpse of all our sin and iniquity, but the effect that it will have upon us is not so much crushing shame, but such meltedness and gratitude to Christ and wonder at the price he paid for us. We shall just be lost in tears of utmost gratitude and wonder. That will be our experience of judgement.