General Information:

In 2:4-15, Yahweh announces his judgment on the nations that surround Judah.

You Cushites also will be pierced by my sword

Here "pieced by my sword" is a metonym for being killed in battle. Alternate translation: "I will kill you people of Cush in battle" (See: rc://en/ta/man/jit/figs-metonymy and rc://en/ta/man/jit/figs-activepassive)