Chapter 8:6 to Chapter 11: the Seven Trumpets

At whatever period the seven trumpets begin to sound, the series is continued until the Lord takes His great power, and reigns. The first four trumpet-actions do not seem to bear directly on men, though the third trumpet-sound causes the waters to become bitter, and many men drink of the waters, and die. The last three trumpets are connected with terrible power and judgment directly upon men living on the earth, and are called the three woes. It is God punishing the inhabitants of the earth. The trumpets are severer in their character than the seals.
We noticed, in considering the seventh chapter, that the angels were not to sound their trumpets until the elect remnant of Israel was set apart — till the servants of our God are sealed in their foreheads. That being done, the first angel sounds a trumpet.