This reminds me of Jack Pershing in the phillipines.
Around 1900, Islam was becoming a really big thing.  And there were a bunch of islamic groups commiting guerilla acts against the US forces.  (Note how I didn't call them terrorists, for it was a war).  
Pershing captured a bunch of them and asked where their leader was.  No one answered.  He delivered the ultimatum.  No one answered.  He killed one guy.  No one answered.
They brought out a firing squad and took aim.  No one answered.  They then brought out a pig right infront of them and slit it's throat.  Each man took 1 bullet and dipped it in the blood.
They couldn't get the guys to shut up.