In May and September 1860 the campaign to conquer the Kingdom of the Two Sicilies by Garibaldi’s army and the Piedmontese army began. Garibaldi reached Messina after two months, while the siege of Bourbon garrisons was undertaken by the Piedmontese army. The siege ended in March 1861, when the Piedmontese artillery forced the enemy to surrender unconditionally. The Kingdom of Two Sicilies became part of the Kingdom of Italy on 17 March 1861.The Anglo-American campaign in Sicily (Husky) was the most impressive amphibious operation of World War II, in terms of the number of divisions landed on the first day and the length of the landing front. On 9-10 July 1943, two armies landed with the main objective of reaching Messina and trapping the enemy on the island, who, as they retreated towards the Strait of Messina, strengthened and improved their defence and transportation systems. On 16-17 August, the Allied troops reached Messina; meanwhile the enemy was landing on the Italian peninsula with a great number of men, together with equipment and other materials that would be used to continue the war in Italy.