From 1553 to 1559, Tuscany raised 30,000 troops (professional soldiers and militia) for their participation in the Last Italian War, which saw the Republic of Siena being added to the duchy. For the decades thereafter, the grand dukes only maintained a peacetime force of 2,500 soldiers, 500 cavalry to patrol the coasts and 2,000 infantry to man castles (Cosimo I having significantly expanded Tuscany's fortification network in an effort to defend the country). An anonymous Venetian intelligence report from the late 16th century stated that Tuscany could spend 800,000 ducats annually on war (half as much as the Spanish-held Kingdom of Naples despite having a quarter of its population), and could raise 40,000 infantry and 2,000 cavalry, counting soldiers, militia, and mercenaries from nearby Corsica and Romagna, a force massively out of proportion to its population. Hanlon considers the report overly optimistic, but with some basis in fact.