If a group of animals stampeded, they all run away together in a wild and scared way.
Stampeded makes people think of fear, chaos, and a lot of noise.
Examples:
The elephants stampeded when they heard the loud noise.
The cows stampeded across the field.
The animals stampeded away from the fire.
The children stampeded out of the school when the bell rang.
The stampeding herd shook the ground.
The stampeding horses were very loud and fast.