1 Nephi 20:14

The text to verse 14:

"14 All ye, assemble yourselves, and hear; who among them hath declared these things unto them? The Lord hath loved him; yea, and he will ^afulfil his word which he hath declared by them; and he will do his pleasure on ^bBabylon, and his arm shall come upon the Chaldeans."

Here, I believe that Isaiah breaks from quoting the word of the Lord and calls again to the house of Israel. He promises that the Lord will fulfill His the promises He made to their fathers long ago. The second part of this verse says that He will do His pleasure on Babylon. His arm shall come upon the Chaldeans. The Bible Dictionary has a couple of good entries on Babylon and Chaldea. I'm not sure if, when this verse was given, that Babylon and Chaldea should be happy about the plans of the Lord or not. I remember that there were times when they were really bad, but perhaps there were times when they weren't. Perhaps the upcoming verses can help us understand more.