The Portuguese fleet was defeated and driven out by the Dutch and the British rivals when they showed up to trade in India.
Portuguese people established new trade routes after the voyage of Vasco Da Gama to India. The spice trade that was initially dominated by the Muslims was now acquired by the Portuguese empire.
New rivals began to enter India and presented serious competition. These were Dutch and British people. The Portuguese did not stand a chance against these rivals.
Therefore, the Portuguese fleet was defeated and driven out by the Dutch and the British rivals when they showed up to trade in India.
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