Joel 2:1-2; 7-10 "Blow a trumpet in Zion; sound an alarm on my holy mountain! Let all the inhabitants of the land tremble, for the day of the LORD is coming; it is near, a day of darkness and gloom, a day of clouds and thick darkness!

Like blackness there is spread upon the mountains a great and powerful people; their like has never been before, nor will be again after them through the years of all generations. Like warriors they charge; like soldiers they scale the wall. They march each on his way; they do not swerve from their paths. 

They do not jostle one another; each marches in his path; they burst through the weapons and are not halted. They leap upon the city, they run upon the walls, they climb up into the houses, they enter through the windows like a thief. The earth quakes before them; the heavens tremble. The sun and the moon are darkened, and the stars withdraw their shining."