Answer:
No matter how hard you hit me, no matter how much I hurt, I'll always go for a laugh. What am I?
I build up castles. I tear down mountains. I make some men blind, but I help others to see. What am I?
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see. What am I?
The person who makes it sells it. The person who buys it never uses it. The person who uses it never sees it. What is it?
I run cold and hot, I look blue but am red. What am I?
If you can spot one of these eastern warriors, it means they're not doing their job right.