"Garibaldi's Red Shirts" refers to the volunteer soldiers led by Giuseppe Garibaldi during the Italian unification in the 19th century. Known for their distinctive red uniforms, these fighters played a crucial role in the Risorgimento, a movement aimed at unifying the various states of Italy into a single nation. The Red Shirts participated in several key battles, including the famous Expedition of the Thousand in 1860, where they successfully captured Sicily and Naples. Their efforts significantly contributed to the eventual establishment of the Kingdom of Italy, marking a pivotal moment in European history.