1st Trumpet
After the first trumpet came hail and fire mixed with blood. One third of the earth burned and one third of the trees and all the green grass burned up.
Remember Exodus 9:22-26 the 7th plague.
The trumpet referred to here was a shofar which is a ram's horn which was used by the Israelites for religious purposes and for warfare.
The last Trump is the longest time the blower of the shofar can hold a note. It refers to the last time the shofar is blown in the Feast of Trumpets.
Background Reading:
Revelation 8:6-7
The 1st Trumpet
6 Then the seven angels who had the seven trumpets prepared to sound them.
7 The first angel sounded his trumpet, and there came hail and fire mixed with blood, and it was hurled down upon the earth. A third of the earth was burned up, a third of the trees were burned up, and all the green grass was burned up.