For level 25, put one in the midddle then in the bottom right then in the top right and then one in the bottom left :) Plus this if it helped (that way other people can read this)
Id like to add that in epic war 1 the player got to fire a crossbow and choose wat troops to train set traps and upgrade defences. in this version its mostly run by the computer, you just tell the computer to attack and it does it all for you. the only thing players get to do is use spells.
Enemy needs to be stronger so that there is a struggle to get to there castle and i think they should have kept the enemy starting with a hero like in epic war 3. Also enemy needs to be able to push your guys away from there castle. At the moment none of them can beat my hero and hes not even upgraded.
Heres a tip, take lots of reserve fuel tanks and dynatmite when u go down to avoid earthquakes. (i once had 1 for 5 times in a row everytime i went to the surface. When you get down to where ur depth meter stops working acurately make sure u have the best hull. Once u get down further every piece of ground that isnt lava, rocks or mineral is a gas pocket so you have to use dynamite to get down about 600 feet... thought id tell you so you can be prepared.