The Spanish threat continued; raiding parties destroyed the Killigrews' family home at Arwenack in 1593, and four Spanish ships attacked the towns along the coast in 1595. In 1597 a Spanish fleet with 20,000 men set out to assault Pendennis and invade England, only being prevented from landing by bad weather. The failed attack caused considerable concern inside government and the Privy Council were informed that the castle was not sufficient to prevent a Spanish landing along the coast. A subsequent review carried out by Sir Nicholas Parker, Sir Walter Raleigh and Sir Ferdinando Gorges recommended that the castle's defences should be significantly extended. The military engineer Paul Ive constructed an Italian-styled ring of earthworks, embrasures, bastions and a stone-revetted ditch around the original Henrician castle between 1597 and 1600, using a team of 400 local workers, costing around £80 a week in wages.