Similarly based on the RuneScape castlewars map, I have made a version of it to be played on a bukkit server.

Requirements(Plugins):
War - http://forums.bukkit.org/threads/mech-fun-war-v1-7-2-minecraft-pvp-arenas-tdm-ctf-more-1-2-5.250/

Requirements(Normal stuffs):
A server
CraftBukkit
Friends!

NOTE: DO NOT RUN THE SERVER UNTIL YOU HAVE THE MAP READY AND COPIED THIS PRE-EDITED WAR PLUGIN CONFIG FILE THAT HAS BEEN PUT INTO THE MAP DOWNLOAD. IF YOU DO NOT DO THIS LIKELY YOUR MAP WILL NOT WORK.

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When you have parked everything into where it is you should be able to run the server smoothly now. If you wish to edit the config for the war plugin to your own style, stop the server and then you can edit it without worry.
This map is still heavily in development so if it looks pretty plain, it's because it is.

Some features include:
DIAGONAL EFFING TNT CANNONS
Barricades
A centre area if you want to face-off
Protected Spawn room
Gates that are openable/closeable from the inside but not the outside

Leave a diamond if you liked this!