Answer:
Squeeze me and I cry tears as red as my flesh, but my heart is made of stone. What am I?
The 8 of us go forth and not back to protect our king from a foe's attack. What am I?
I am all around yet to me you are half blind. Sunlight makes me invisible and difficult to find.
The more you have me, the less you see. Shine a light on me and I flee. What am I?
I am heavy forward, but backward I'm not. What am I?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.