The game takes its name from the tableau which depicts an eagle-like bird spreading its wings in flight.
Thirteen cards are dealt face down as one pile, and will act as the "trunk" of the eagle, e.g the reserve.
When there are no more moves to be made from the wings, the stock is dealt one card at a time to be played onto the foundations.
When the trunk is down to its last card, it is turned face up and immediately available to be built onto the foundations without having to wait for an empty space on the wings.
Many software implementations of Eagle Wing follow these rules, with a maximum of three cards per space.