The prophet Joel describes this very season Joel chapter 2: Blow the trumpet in Zion, And sound an alarm in My holy mountain! Let all the inhabitants of the land tremble; For the day of the LORD is coming, For it is at hand.
verse of the day
The Lord shall lead his people as they fight! His arrows shall fly like lightning; the Lord God shall sound the trumpet call and go out against his enemies like a whirlwind off the desert from the south.