The Small Bomb often goes unnoticed because its potency has as much punch as a wet noodle to the face. Most players will sprinkle them around the base, or stack them up next to a giant bomb to create a somewhat Ghetto Double Giant Bomb.
At TH9, a max Small Bomb will take out a max Wall Breaker before it has time to detonate. You must place these small bombs in areas you get Wall Breaker action the most and have a 1 tile gap from the wall.
JTJ Clan goes into details about this little guy and where TH9s should be planting them at war.
https://jtjclan.wordpress.com/2015/09/10/the-enigmatic-small-bomb-a-th9-lifesaver/
At TH9, a max Small Bomb will take out a max Wall Breaker before it has time to detonate. You must place these small bombs in areas you get Wall Breaker action the most and have a 1 tile gap from the wall.
JTJ Clan goes into details about this little guy and where TH9s should be planting them at war.
https://jtjclan.wordpress.com/2015/09/10/the-enigmatic-small-bomb-a-th9-lifesaver/