 In 1730 he returned to Spain and was promoted to chief of the Mediterranean Fleet; with this force he went to the Republic of Genoa to enforce the payment of two million pesos owed to Spain that had been retained in the Bank of San Jorge.Deeming the honor of the Spanish flag to be at stake, de Lezo threatened the city with bombardment.In 1732, on board the "Santiago", he and José Carrillo de Albornoz commanded the enormous expedition to Oran and Mers-el-Kébir with more than 300 ships and around 28,000 troops, comprising infantry, cavalry and artillery.