Causes instant death to the first group of enemies that step on it, bouncing up to 15 housing units of Troops. For example, it will bounce 15 Archers or 3 Giants.
P.E.K.K.As, Golems and Heroes are unaffected due to the fact that they take more than 15 housing space.
If put in a strategical way, Spring Traps can ruin a raid, including the infamous Giant-Healer combo.
The Spring Trap often does not affect the Goblin either, but this is because the Goblin is too fast for the Spring Trap to bounce it away (it usually is able to move out of range before the Spring Trap has the opportunity to affect it). However, if the Goblin doesn’t continue moving once the Spring Trap has been triggered (stopping to attack a resource building, for instance), it will be bounced similar to a Barbarian or Archer. Also, if there is a horde of Goblins, the Spring Trap will bounce the Goblins in the back, since the Goblin in front triggered it first.