Answer:
I help engines spin and pants stay up.
Dead on the field lie ten soldiers in white killed by one blade yet there was no fight. What are they?
I am a sound made by felines when petted.
Everyone has me, but nobody can lose me. What am I?
In wealth I abound; in water I stand; as a fencer I'm valued all over the land; at Venice I'm famous; by farmers I'm prized; respected by law yet huntsmen despised; consternation and ruin ensue when I break; And the beasts of the forest advantage won't take.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.