This is an archived and outdated Travian server world and not active anymore. You can go to other non-archived Travian servers here: Change Travian server
To take full advantage of the defense tables, you must be logged in and have filled an your Travian account.
Defense tables for speed.travian.co.uk
The defense tables help you greatly to request and coordinate defense.
If you got attacked, you can create the defense table, and give it to other defensive players. The defensive players can easily see their own travel time from their villages to your attacked one, so they can send you defensive troops quickly.