Sweeper Achievement - Assassin's Creed II Guide

Sweep 5 guards at once by using a Long Weapon. To gain the ability to use a sweep attack you must talk to the trainer near your stronghold. From there go to special moves and then to long weapon. Complete the training and you will gain the ability to use the move. Once you've learned it go to any city and keep any eye out for a solider with a long weapon, such as a spear. Once you see one disarm him, so you get his weapon. Then get a big group of guards in front of you and use your sweep attack by holding the attack button. If you have questions, feel free to write a comment :)