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Why did Isaiah see Assyria as an instrument of God’s judgment?

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The prophet Isaiah — Isaiah Miniature of Isaiah, manuscript illumination from *The Siegburg Lectionary*, 12th century.

Isaiah viewed Assyria as an instrument of divine judgment because he believed that God actively shapes history and intervenes to chastise his own people for their moral failures.1

In Isaiah’s theology, the Covenant between God and Israel was conditional, contingent upon the people's conduct. Observing the rampant injustice, violence, and moral decay in 8th-century Jerusalem, Isaiah concluded that the nation had alienated itself from God. Consequently, he interpreted the westward expansion of the Assyrian empire under Tiglath-pileser III as a manifestation of God’s wrath.12

Isaiah explicitly identified Assyria as the "rod of my anger" and the "staff of my fury," sent by God to punish a "godless nation". While he saw Assyria as a tool for divine correction, he also maintained that Assyria itself would eventually face God’s judgment for its own atrocities in war.13