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Wo Long: Fallen Dynasty's 15th mission, otherwise known as the Decisive Battle of Guandu, is the penultimate Main Battlefield in the game. Not counting side missions, this level is the last Main Battlefield that has any Marking Flags since the final mission is a boss fight.
There are seven Marking Flags to find in the Decisive Battle of Guandu, one of which requires you to complete an optional fight against Aoye in an arena before you fight Yuan Shao during this level. The flags can be hard to find, so we've got you covered in your endeavour.
First Marking Flag Location
From the first Battle Flag at the start of the level, continue forwards and head to the left when you can. There will be a broken wooden ram, with a wizard on top and a tiger demon patrolling around it. Go past these and jump up the ledge.
Head forwards and to the right, passing by the patches of fire and crossing the rickety wooden bridge. This will lead you to the first Marking Flag and a ladder shortcut back to the start of the level.
Second Marking Flag Location
From the second Battle Flag by the large gate, turn around so your back is facing the gate. Take the path on your right and take care of all the enemies you see dotted around. Stay on this path, and you will come to a small puddle of mud and a huge demon patrolling around it.
To the left of the mud, there is a short ledge you can climb up. Go up there and interact with the trebuchet furthest from you to destroy part of a gate on your right, opening a new path. The marking flag is behind this gate, alongside a treasure chest.
Third Marking Flag Location
From the above Marking Flag, make your way across the glowing red vines to enter the fort. As you enter the ruined town, you will see destroyed homes and an archway wrapped in red vines.
Ignore the archway and head diagonally to the left, entering the building you see in front of you with a torch burning outside. Enter the house and drop down. Follow the vines, and eventually, you will come to the Marking Flag guarded by two enemies.
Fourth Marking Flag Location
For this Marking Flag, you should travel to the sprawling optional arena that can be found after the section with the rows of giant stone soldiers. Jump into the arena to trigger another mini-boss fight with Aoye.
Defeat Aoye to unlock the third Battle Flag. From this flag, climb up the ledge and then the red vine. Jump up again to the left to find the Marking Flag.
Fifth Marking Flag Location
From the above Marking Flag, jump up the red vine and kill the enemy waiting at the end. Jump down and go forward to reach a house that will be locked on the left side. Open the door to find the fourth Battle Flag.
Go back into the house and run across the red vines in front of you. This will take you to the roof of a house. When on the roof, drop down to the right, where you can see an enemy standing. The Marking Flag is inside the house.
Sixth Marking Flag Location
Return to the fourth Battle Flag and go inside the house that was locked until just now. Instead of going forward, head to the right to continue on the main path to progress the level. When you come off the red vines, take the route on the left, going past the pool of mud and the patrolling ape demon.
Follow the red vine around, and you will come to a house that has a warlock sitting inside it, chanting and buffing a nearby tiger demon. He is also sat directly in front of the Marking Flag.
Seventh Marking Flag Location
At the Battle Flag directly outside Yuan Shao’s boss room, turn around and keep the entrance to the building on your right. Jump up onto a small ledge and continue over it, making your way to the ledge and red vines in front.
You will see from the edge of the path that the final Marking Flag is nestled between some red vines in front of you. Drop down onto the red vine just below, and jump across the gap to reach it. That's every main mission Marking Flag found. If you've missed any, be sure to check our complete guide to Wo Long to fill in any gaps.