by derPavlov http://dev.bukkit.org/server-mods/cannons/
Copy 'Ironclad.jar' into your 'plugins/' folder.
Load your server
Edit the newly created 'config.yml' in 'plugins/Ironclad/' and set your preferences
Delete the folder called 'Ironclad' in plugins/.
Delete 'Ironclad.jar'
Have fun