Only regular defense is considered when you are ATTACKing a planet (killing the population) but when you hit the INVADE button, Invasion Defense gets factored into the equation. Related to this, there is Attack and Invasion Attack. Attack is in effect when you are killing the population but Invasion Attack kicks in when you attempt an invasion. Read
this thread in Strategy in its entirety for a better understanding of the Invasion calculations..
_________________Ranks 400+ Join us in exploring..

[20:40] Wredz: just hacked a massive extremely rich minting planet from someone.. thats the best planet i ever hacked
[20:43] DarthFlagitious: is it spearmint or peppermint?