ISB ~ Revelation 12 v10

Now the salvation:Heaven celebrates the expulsion of the devil and his angels. This is not the fall of the angels at the dawn of time (12:4), but the defeat of evil at the turning point of salvation history, when Christ mounted the Cross and cast out the ruler of this world (Jn 12:31-32; Col 2:15).

the kingdom:See note on Rev 11:15-19.

accuser of our brethren:The devil is a prosecuting attorney who makes damning accusations against the saints (Job 1:6-11; Zech 3:1).