According to Revelation 8:1-2 the angels sound these trumpets after the breaking of the Seventh Seal, which secured the scroll of the apocalypse, marking the Second Coming of Christ.

In the final book of the New Testament, seven trumpets are sounded, one at a time, to set off apocalyptic events seen by John of Patmos in his vision.According to Revelation 8:1-2 the angels sound ...