The last trumpet is exactly that - it is the last. It is the end. It is the final trumpet. The last trumpet is a trumpet of war. The last trump ushers in complete and wholesale destruction for all those left behind.
We find the phrase “battle trumpet” in 2 Samuel 2:28, 15:10, 18:16, 20:1, 20:22. This is the trumpet that spells the end.
Numbers 10:9
And if ye go to war in your land against the enemy that oppresseth you, then ye shall blow an alarm with the trumpets; and ye shall be remembered before the LORD your God, and ye shall be saved from your enemies.
Joshua 6:20
So the people shouted when the priests blew with the trumpets: and it came to pass, when the people heard the sound of the trumpet, and the people shouted with a great shout, that the wall fell down flat, so that the people went up into the city, every man straight before him, and they took the city.
Judges 7:22
And the three hundred blew the trumpets, and the LORD set every man's sword against his fellow, even throughout all the host: and the host fled to Bethshittah in Zererath, and to the border of Abelmeholah, unto Tabbath.
Nehemiah 4:20
so wherever you hear the sound of the trumpet, come over to us, and our God will fight for us!"
Ezekiel 7:14
They have blown the trumpet, even to make all ready; but none goeth to the battle: for my wrath is upon all the multitude thereof.
Jeremiah 4:19
My bowels, my bowels! I am pained at my very heart; my heart maketh a noise in me; I cannot hold my peace, because thou hast heard, O my soul, the sound of the trumpet, the alarm of war.
Jeremiah 4:21
How long shall I see the standard, and hear the sound of the trumpet?
Jeremiah 6:1
O ye children of Benjamin, gather yourselves to flee out of the midst of Jerusalem, and blow the trumpet in Tekoa, and set up a sign of fire in Bethhaccerem: for evil appeareth out of the north, and great destruction.
Jeremiah 42:14
Saying, No; but we will go into the land of Egypt, where we shall see no war, nor hear the sound of the trumpet, nor have hunger of bread; and there will we dwell:
Jeremiah 49:2
Therefore, behold, the days come, saith the LORD, that I will cause an alarm of war to be heard in Rabbah of the Ammonites; and it shall be a desolate heap, and her daughters shall be burned with fire: then shall Israel be heir unto them that were his heirs, saith the LORD.
Jeremiah 51:27
Set ye up a standard in the land, blow the trumpet among the nations, prepare the nations against her, call together against her the kingdoms of Ararat, Minni, and Ashchenaz; appoint a captain against her; cause the horses to come up as the rough caterpillers.
Amos 2:2
But I will send a fire upon Moab, and it shall devour the palaces of Kerioth: and Moab shall die with tumult, with shouting, and with the sound of the trumpet:
Zephaniah 1:16
A day of the trumpet and alarm against the fenced cities, and against the high towers.
Hosea 5:8
"Sound the trumpet in Gibeah, and the alarm in Ramah. Cry out at Beth-aven Go out, Benjamin!
Zechariah 9:14
And the LORD shall be seen over them, and his arrow shall go forth as the lightning: and the Lord GOD shall blow the trumpet, and shall go with whirlwinds of the south.