The term "Great Army" in the Bible often refers to a formidable and vast military force, typically used in the context of divine judgment or significant historical events. This concept is primarily found in the Old Testament, where it is associated with both the armies of Israel and the forces of their adversaries. The notion of a "Great Army" underscores the themes of power, divine intervention, and the fulfillment of prophetic declarations.

Joel 2:11
In the book of Joel, the "Great Army" is depicted as an instrument of God's judgment. Joel 2:11 states, "The LORD raises His voice in the presence of His army. Indeed, His camp is very large, for mighty are those who obey His command. For the Day of the LORD is great and very dreadful—who can endure it?" . Here, the "Great Army" is seen as a divine force executing God's will, emphasizing the sovereignty and power of the Lord over the nations.

Ezekiel 37:10
The vision of the Valley of Dry Bones in Ezekiel 37 also alludes to a "Great Army." After the bones are brought to life, Ezekiel 37:10 describes, "So I prophesied as He commanded me, and the breath entered them, and they came to life and stood on their feet—a vast army" . This passage symbolizes the restoration and revitalization of Israel, portraying the nation as a powerful and unified force under God's guidance.

2 Chronicles 14:9-15
In the historical context, the Bible recounts instances where Israel faced overwhelming military forces. In 2 Chronicles 14:9-15, Zerah the Cushite came against King Asa of Judah with a "vast army" and 300 chariots. Despite being outnumbered, Asa relied on the Lord, and God delivered Judah from the Cushites. This narrative highlights the theme of divine deliverance and the futility of relying solely on human strength.

Revelation 9:16
In the New Testament, the Book of Revelation presents apocalyptic imagery involving a "Great Army." Revelation 9:16 mentions, "The number of mounted troops was two hundred million; I heard their number" . This symbolic army is part of the visions of the end times, representing the scale and intensity of the spiritual and physical battles that will occur before the final establishment of God's kingdom.

Symbolism and Themes
The concept of a "Great Army" in the Bible serves as a powerful symbol of God's might and the unfolding of His divine plan. It reflects the reality of spiritual warfare and the ultimate triumph of God's purposes over human and demonic opposition. The "Great Army" also serves as a reminder of the need for faith and reliance on God, rather than on human strength or numbers, in the face of overwhelming challenges.

Throughout the Scriptures, the "Great Army" is a testament to the themes of judgment, restoration, and the fulfillment of God's promises. Whether as a literal military force or a symbolic representation, it underscores the overarching narrative of God's sovereignty and the eventual victory of His people.