4. The invincibility of the army 2:10-11

2:10 The earth trembles as this army advances. The heavens also tremble. The sun and the moon grow dark, and the stars fade from view. Cosmic disturbances like these are common in biblical descriptions of Yahweh waging war (cf. 3:16; Judg. 5:4; Ps. 18:7; 77:18; Isa. 13:10, 13; Ezek. 32:7; Zech. 14:6-7; Rev. 6-18).

2:11 It now becomes clear that Yahweh is leading this army against Jerusalem. Normally the Lord fought forHis people, but here Joel saw Him leading an army againstthem. He is the one who is directing the soldiers with His voice. His host is both numerous and strong. The day of this attack, the day of the Lord, is great and awesome, and no one can withstand it (cf. Mal. 3:2; 4:5).