The primary objective of the side quest Yackers ‘n’ Fash in Kingdom Come: Deliverance 2 is to find the stolen standard. This quest is available in the Kuttenberg region, and can be encountered while exploring the southwestern part of the city. This guide will cover all you need to know about completing this objective.
How To Find The Stolen Standard Kingdom Come: Deliverance 2

Talk to foreman Vlach in the Black Horse Tavern in Kuttenberg to get the Yackers ‘n’ Fash quest. He will tell you a group of thieves who call themselves Saints have stolen the stang (a pole or a standard) of a great miner known as Anthony. You need to get it back from their hideout beneath a church. Go to the objective marker and head inside the building. Lockpick the first door on your right, but be aware as there are two maids roaming the hallways during daytime.

Go downstairs and talk to foreman Joerg Preng. You can either fistfight, play dice, or use skill checks on him to get the information you want. He will tell you that he sold the standard to a merchant named Hensel, who is now enroute to Prague and might be found near Bylany.

Travel to Bylany and start heading southeast, you will eventually come across a bloodied cloth and pieces of a wooden barrel. Henry comments that this might have fallen out of the cart, so follow the route ahead. You then come across a clue that hints towards the forest. Head into the forest until you reach the location shown above, where you will find the abandoned cart.

Proceed ahead, and you will able to hear wolves growling nearby. Go towards the sound and fend off the wolves, then examine the body which turns out to be the merchant Hensel. Look straight ahead, and you will see a mill and a small settlement. Advance in that direction carefully, as you are up a hill and it is very easy to fall and die.

Upon reaching here, you learn that this is the region called Danemark, and has several bandits roaming around. Dispose of them however you want, then go into a shed nearby and climb up the ladder. You will know which building you need to go to by listening to the praying sound of a woman. Untie them and you will complete the highly missable “Tragedy in Danemark” side activity.

Go inside the building in front of another cart by the campfire, where you will see the corpses of the rest of the mill workers. Lockpick the chest on your right to find the “St. Anthony’s Standard”. If your lockpicking skill is low, you can loot the keys from the body of the bandit called Little John. Return to Vlach and give him the standard.
You are rewarded 250 groschen to complete this quest.