From President Bush's speech tonight:

In these 19 months that changed the world, our actions have been focused and deliberate and proportionate to the offense. We have not forgotten the victims of September the 11th, the last phone calls, the cold murder of children, the searches in the rubble. With those attacks, the terrorists and their supporters declared war on the United States, and war is what they got.

From Civil War General William Tecumseh Sherman:

"War is the remedy that our enemies have chosen, and I say let us give them all they want."