An important sequence in the book of Revelation is the Seven Trumpets. When the angels sounded their trumpets, important events were released on earth and in heaven (Rev 8,9). This followed a period of intense intercession in earth (Rev 8:4-5).
The first trumpet brings destruction on earth (Rev 8:6-7). I believe it represents a terrible war that draws in many nations. It might have been fulfilled by the world wars of the twentieth century.
The second trumpet causes a huge mountain to be thrown into the sea (Rev 8:8-9). A mountain is a law system (Is 2:3-4). The sea represents the people of the world (Rev 17:15). I believe this falling mountain is the collapse of the natural law system that had prevailed for many centuries. The rise of democracy destroyed natural law and replaced it with man-made law. This has been a disaster for justice.
The third trumpet caused a great star to fall on the waters of the earth (Rev 8:10-11). Its name was Wormwood, which means bitter. It made everything bitter. In Revelation, seven stars were the angels of the seven churches (Rev 1:20). This event represents the decline of the church in an important part of the world. This church falls away and comes under the control of the spiritual powers of evil.
The fall of the church turned the waters bitter. This is a description of spiritual life in that part of the world turning bitter. This church becomes bitter and a source of spiritual death.
After the fourth trumpet is sounded, the sun, moon and stars turn as dark as night (Rev 8:12). In Revelation, the sun moon and stars represent Israel (Rev 12:1; Gen 37:9) so this is a description of a very dark time in the nation of Israel. It is probably the events often referred to as Jacob’s sorrows.