1.

Import Catapult from Props \ Medieval World

2. Open the Timeline menu
3. Under Track list, choose Catapult
4. Right click on the Catapult track, there are 2 options to choose from. You could select Act_fire and then click play button to get an attacking animation.
5. You can use Timeline to set the distance and speed of the rock's projectile.
6. You can apply particle effect to add fire and smoke effect to the fireball.
 
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