If you are unfriendly with a faction then they should attack you when you are in sight of them instead of just sitting there waiting for you to hit em.
Just so you guys know, the power of your zombies are all multiplied together, and the attack and defense are averaged out. So no matter what, adding more zombies to an army will always make it more powerful and if the attack and defense are more balanced you will always have more power (example: 5p x 7a x 3d = 105 , 5p x 5a x 5d = 125).
Tip: If you have ninjas upcoming, put a demon tower at the start, if you base most of your defense on the gemroom, the ninjas should lose their stealth by the time they get to your defenses.
For people who are going to breach for the first time, spend 1 uC on offline gains, 1 uC on Upgod, or 2 uC on Upgod. Upgod is very important, as with it it will be MUCH MUCH easier to gain extra uC, as you only gain 1 uC per _e5 tangerines. I have UpGod lvl 5 and I made 5 uC with it in my last breach by having 1e25 tangerines! + so people can see.