Answer:
The more I dry, the wetter I get. What am I?
I can be entertaining until you realize some pieces have been lost.
Dead on the field lie ten soldiers in white killed by one blade yet there was no fight. What are they?
I hide in a dark tunnel awaiting my time. I can only be released by pulling back. Once released I may do unstoppable damage.
Crooked as a rainbow and slick as a plate, ten thousand horses can't pull me straight. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.