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.