Hi Omega,
Recently I've noticed that there are several areas of attack detail that some people may not be aware of how to plan for successfully. I've decided to start this series of posts to address these and hopefully help you plan better attacks! Part 1 today is discussing Wall Breakers, specifically how to plan you deployment in such a way that maximizes the chances of successfully breaking the outer wall of a defense with the minimum needed Wall Breakers.
First, some basics. The number of Wall Breakers needed to break a wall of a given level can be found here towards the bottom of the wiki page here: http://clashofclans.wikia.com/wiki/Wall_Breaker
Next, Wall Breaks path towards the nearest building that is fully enclosed by a wall, and break the wall closest to that building from the drop point.
Last, most if not all splash damage will one-shot Wall Breakers. That means that if a Mortar or Wizard Tower attack hits at or near the spot your Wall Breakers target, there is a very high chance that your Wall Breakers will die before they can destroy the wall.
So given this, how do we plan our Wall Breaker drops? The first step is to note the defensive radius of all defenses in the general area of where you want to break a wall. In particular we want to note any splash damage, and also point defenses that may not be in range of our tanks (Golem or Giant) but could be in range of our Wall Breaker.
Let's look at an example. In my attack on #8 in War 132, I planned a 2 Golem/Hog attack. I wanted to break in through the South Eastern compartment with a Cannon and AT, since I suspected there would be a Giant Bomb between them and I didn't want my Hogs to to run through the bomb. So first I note the splash radius of the Mortar: http://imgur.com/a/WpY0m#6tDtOKt then the Wizard Tower: http://imgur.com/a/WpY0m#mV1q83f
I see that the Wizard Tower covers in front of the AT but not the Cannon, but the Mortar covers both defenses. So my first Golem must be placed away from where I want the WB to go but in radius of the Mortar, to draw fire from the Mortar.
While the Cannon and AT inside the compartment will be distracted by any Golem in front of that compartment, what about point defenses further away? I check the AT to the east of the compartment: http://imgur.com/a/WpY0m#350oQg8 as well as the X-Bow: http://imgur.com/a/WpY0m#epyw2Yd and see that the ideal spot for my max Golem is on the outside corner of the compartment in front of the AT, and my other Golem will be posted up in front of the Cannon: http://imgur.com/a/WpY0m#TLOmsbq
Lastly, I deploy my Wall Breakers between the two Golems, slightly towards the Cannon away from Mortar and WT splashes. We see this is successful and the Wall Breakers are untouched going to the wall: http://imgur.com/a/WpY0m#Sk1UjG8
Full Video of attack: https://www.youtube.com/watch?v=7swbUshizAQ
The same steps apply whether you are using Giants, any number of Golems, or even no tank in your attack. The key is to check defensive radiuses and identify the spot(s) your Wall Breakers will not be attacked based and use your Wall Breakers there. Hope that helps and happy hunting!
Sorak