Does defensive units sent on raids add to the amount of resources that are collected, or do defensive units have no or little advantage?

Sir...A word of advice..Never use defense as an offensive unit...You can and there is nothing in game that will stop you from doing so, but Defensive units used to attack/raid..(used offensively ) are lost/killed very easily because they offer very little in offense ability..In like manner..Offensive units used as Defense also are lost/killed very easily because they offer very little in defense ability..Now..to answer your question..Should you choose to se nd defenseon an raid they only offer what thier loading/carrying ability allows (capacity ),,if they survive the attack/raid

Thanks for the answer and advice!