Nails, Pencils, and Chains by Vicki

For want of a nail, a shoe was lost; For want of a shoe, a horse was lost; For want of a horse, a rider was lost; For want of a rider, a message was lost; For want of a message, a battle was lost; For want of a battle, a kingdom was lost; And all for the want of a horseshoe nail.

Source: Nails, Pencils, and Chains by Vicki