One of the Guild Challenges for the Mercenary's Guild in Assassin's Creed: Brotherhood states:
- 25 Guards killed while on horseback
Does this mean I need to kill 25 guards while I am on a horse, or kill 25 guards while they are on a horse?
I tried testing both but the counter seemed to increment way less than the number of each type that I killed, so I'm not sure if I'm missing some special requirement.