Part 1: Pursuit
Once the mission begins, you’ll see a pair of enemies in the distance start running away, the game will tag them with red objective markers to make things easy for you. Focus on catching one at a time and chase them across the rooftops until you get into range and either assassinate them, or to make things even easier, equip your pistols and shoot them when they are highlighted to take them down from afar.
Once you have killed both of the targets a short cut-scene will play.
Part 2: Attack
This section has us attack a nearby fort and run amok. We need to cut down the flag on the closest sniper tower and loot 10,000 L worth of treasure from inside the fort within a 4 minute window. To make things trickier, you’ll also be given the optional objectives of lock picking two doors and looting every chest (10 in total). The chests are found in pairs and are all behind rickety wooden doors that can be destroyed with shrapnel grenades or lock picked and there are a couple that can be blown up using powder kegs located nearby.
From the start, we’ll want to go across the street, hop the fence and climb the tower ahead to cut down the flag on the roof. This will free some prisoners who will keep the guards semi-engaged as you go about your looting work. Note that if you get the opportunity you should try to help the prisoners by assassinating guards if you get the chance but only if you can insta-kill them, you really don’t want to be drawn into a fight with the time limit.
Once the flag is down, a short scene will show the prisoners being let out. Once you regain control, move straight forward and dive into the hay in the courtyard below. Turn to your left to find a single guard fighting with a prisoner. Kill the guard and then you should be able to lock pick the two doors here to complete the first optional objective.
Once that is done, simply head around to the next three doors, blow them open and loot the pair of chests inside each. Again, I reiterate that you only want to kill guards if they get in your way, otherwise leave them be and focus on looting. If you do that, you should be able to loot all of the chests with about 1 minute left on the timer.
Once you have looted all 10 chests, escape the fort however you like and escape the area to complete the memory.