There was an air power article around the time of GW1 that was really EBO just didn't have the catchy name. Basically the enemy and allies could be considered as onion rings.
In the case of Saddam you either had to peel away each layer or go for the executive option. At the time EO was frowned upon as not quite sporting - I think it was based on Carter's orders.
In the case of the allies Sadam's target set was the outer layer of our onion. Kill people create a peace movement.
Both EBO depended upon the correct selection of target and aim.