sentences:  He served in the Italian war of 1735 and went to Havana in 1740, where he was appointed lieutenant governor of Puerto Principe, Cuba and later of Santiago de Cuba.During the Seven Years' War he defended Havana against a British siege, in 1762.Unzaga accompanied Alejandro O'Reilly to New Orleans in 1769 to put down the Rebellion of 1768 by French and German colonists objecting to the cessation of Louisiana to Spain via the Treaty of Fontainebleau (1762).