Ac 2 v 24 - Leader of the Pack
0Unlocked After: Sequence 5 - Memory 1: Four to the Floor
Your target is the leader of a garrison at the north end of Florence. First, you must locate a lead and tail him to the garrison. Follow the green target on the Mini-Map to reach the area where the lead can be found. Activate Eagle Vision and search the zone for the guard marked in gold. Once you've located the lead, keep your distance and begin to follow. If you get too close, the guard will become suspicious; if he turns to you and the arrow above his head begins to fill with yellow, back off immediately and wait for him to forget about you and continue on his way.
Continue following the guard until you reach the garrison. Hire the Courtesans outside and use them to distract the guards blocking the entrance. When the guards move to socialize with the Courtesans, slip past them and enter the garrison. The troops are gathered inside, and your target is among them. Grab hold of the wall and use Eagle Vision to identify your target. Then, climb up onto the wall, lock on to the leader and press the X/Square button to perform an Air Assassination. If that fails, just slash him to death and then get the heck out of there. - https://www.supercheats.com/guides/assassins-creed-ii/