There is another part to the story of Achilles that I didn't mention. As a child, his mother held him by his feet and dipped the rest of him into a magic body of water that was supposed to heal everything. I've forgotten the body of water, will need to look that up. Any way his whole body was protected from all harm except his ankles and feet.
Now you know the rest of the story . . .
Thank you so much, VIckie! It's always so good to hear from you! I think your yarrow will keep on growing and maybe it will bloom.