He first served as a soldier in the Italian War of 1551–1559 under the command of famous admiral Andrea Doria, participating among others to the liberation of Porto Ercole, then besieged by Piero Strozzi.
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Always with his fierce cousin, he commanded the Florentine artillery in the war for Siena in 1554; the nexy year in the summer he first took by assault Porto Ercole fortress after a four-day artillery barrage, then with 700 German Landsknechts he defended Populonia against a Turkish sea-bourne assault, receiving support from the Florentine cavalry.
Famous buyers include the Dutch Royal Family, who used an early DAF-based Shellette at their summer property in Porto Ercole, and Jacqueline Onassis, who employed a later model Shellette on the Onassis' private island Skorpios.