OK, thanks. I was finally able to free some of my guys from the barb onslaught and had them take out the remaining 2 AI civs. This was before Turn 400. I am still a little mystified as to why the barbs kept coming at me (more than 200 turns) and ignoring those 2 civs as they continued to expand with their one-defender cities. Usually, you get pounded for awhile, then they go after someone else. But, in this game I continuously got it.