To destroy the 5 Black Bears’ battle weapons is an objective in Crimson Desert Chapter 6, Main Quest: Hidden Fangs. The battle weapons look like round wooden tanks that shoot cannon balls. They all drive around the field in red search area.
They are in the fields in the southern half of the search area and around the center (not in the north).
Here’s what the “Battle Weapons” (tanks) look like:
How to Destroy the Battle Weapons:
You must shoot a Whistling Arrow at them – hold 
and at the bottom press 
/ 
on the arrows to select it. Then shoot it by holding and releasing 
/ 
. This will cause an air bombardment to destroy the tank.
If you run out of whistling arrows, return to any of the friendly encampments in the area, for example the one in the south-west of the red search area:
The best approach is to ride in quickly with the horse, shoot a whistling arrow, ride away to look for the next tank. You don’t need to bother with the smaller enemies, can ride past them if you want to save time.
Battle Weapon Locations
They drive around in the open fields, they are not stationary and their exact spots can vary slightly, but will always be close to the marked spots. Just make sure to track the quest from the journal to see the search area, if you die it sometimes automatically becomes untracked.
Battle Weapon #1 & #2 (close together, driving around same field)
Battle Weapon #3
Battle Weapon #4
Battle Weapon #5
For more guides check our Crimson Desert Walkthrough.
Ltb says
Or you can just break it down yourself with the light+heavy attack skill.