John Gill Commentary Jeremiah 51:4

"And they shall fall down slain in the land of the Chaldeans, and thrust through in her streets." — Jeremiah 51:4 (ASV)

Thus the slain shall fall in the land of the Chaldeans By the sword, or by the arrows and darts of the Medes and Persians: and [they that are] thrust through in her streets ; either by the one or by the other, especially the latter, since they only are mentioned; (See Gill on Jeremiah 50:30).