The most frequently asked question about defensive cores is “What is a high vs. low troop count?”.
It’s a hard question to answer without knowing your SH’s individual setup… but we’ve added as accurate of an answer that we can, while remaining generic enough for it to apply to pretty much everyone.
When we’re referring to High vs. Low troop counts – we’re talking about the ability for you to kill the entire attacking march. If your troop count is so low that some of your attacker’s troops return home, add more attack and test again. Continue to add attack and test until you’ve found the “sweet spot” where you’re killing the whole march and then stack defense on top of that.