"It is not yours to question why, it is yours to do and die..." who said this?

Question

Some say shakespere some say tennyson and others say the military but who really came up with this quote.

Answer 1

It is william shakespeare " to be or not to be" which inspired many authors to write under the same subject and I  am guessing from what I read that  Alfred Lord Tennyson just went more into detail and said"Ours is not to reason why. Ours is but to do and die",

Answer 2

I think the original quote was

"Theirs not to reason why. Theirs but to do and die."

Alfred, Lord Tennyson

"The Charge of the Light Brigade"