That goes against what we are taught that the southern soldier fought for greed and the ownership of his slaves.

The soldiers on both sides, North and South, fighting for their respective "countries" is the only reasonable explaination which makes the most sence as to why they both fought so hard.

The soldiers always asks "What are we fighting for?", "What am I giving my life for?". And unless he has a pretty good answer to that question he doesn't fight or at least not to his fullest abilities.

A soldiers is a man, or now days a woman, that loves his life as much as any other man, or woman. No one wants to lose his life uselessly. So, What makes a man go to war and fight?

Yes, he might be forced by law to join an army in a draft. But, that law doesn't make him fight. He might be put in a position where he might have to fight to survive. But what keeps him from surrendering at the first shot, or before?

In my opinion, they fight for something bigger than themselves. This is demonstrated time and again during the War for Southern Independence that men on both side willingly walked into the cannons mouth in charges like Pickett's charge and for what? The right to own another man?

I don't think so. That wasn't an important enough reason, in my opinion, for men to fight like that. An if that were the only reason for Southern States to secede there would have never been a single one that did so.