  The Yang-Mills theory lies at the heart of our understanding of elementary
particle interactions. For the strong nuclear forces, we must understand this
theory in the strong coupling regime. The primary technique for this is the
lattice. While basically an ultraviolet regulator, the lattice avoids the use
of a perturbative expansion. I discuss some of the historical circumstances
that drove us to this approach, which has had immense success, convincingly
demonstrating quark confinement and obtaining crucial properties of the strong
interactions from first principles.
