With the Marathas being accustomed to a land-based military, Shivaji widened his search for qualified crews for his ships, taking on lower-caste Hindus of the coast who were long familiar with naval operations (the famed "Malabar pirates") as well as Muslim mercenaries. Noting the power of the Portuguese navy, Shivaji hired a number of Portuguese sailors and Goan Christian converts, and made Rui Leitao Viegas commander of his fleet. Viegas was later to defect back to the Portuguese, taking 300 sailors with him.