How did a bag of nails win the battle of Waterloo?

The phrase "a bag of nails won the Battle of Waterloo" refers to the idea that seemingly minor details can have significant consequences. During the battle, the Duke of Wellington's forces used nails to secure their footwear and maintain better traction, which ultimately contributed to their effectiveness in combat. This highlights how small, often overlooked factors can influence the outcome of larger events, such as a pivotal battle in history.