
The following guide has not been updated for EoC however, the new way is MUCH easier. The attacker role is based on different attack styles which can be found in the constitution section of the abilities book (only after you have gone into game) It is useful to have the attack styles on your ability bar but if you are still unsure, I can help at the event

http://runescape.wikia.com/wiki/Barbarian_Assault
As this minigame is made for 5 people, no more or less than 5 can play so unfortunately if more than 5 people turn up it will have to be the first 5 to arrive. Or if we get 10 then we can make two teams ;)!
Don't worry... I'll take the dreaded defender role!!