something about after the Battle of Changping the youngest were freed the rest of the captured soldiers were buried alive?
The campaign took three years. An impatient king fired his general for pursuing a siege strategy. The new guy took the fight to the Qin but was lured into an envelopment. They still held out another 40 days.
And yes, the Qing massacred all but a few of the youngest soldiers. Legend has it 400,000, but that is certainly an exaggeration.
This battle cleared the way for the Qin unification of China.
http://en.wikipedia.org/wiki/Battle_of_Changping