Head ladies do a Wheel Chain. While the head ladies are still wheeling in the center, side men send their partners to the right to right arm turn with the head men and return to partners. All now turn by the left (side ladies with partners, head ladies with opposites). Side ladies then go in for the Wheel Chain while the head men send their current partners to the right where the side men turn them by the right and send them home. All now turn by the left. Everyone at this point has opposites for partners. Repeat the above sequence for a full Island Chain to end with partners.
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.