Every vessel arriving in the Virginia colony was compelled to show a cocquet upon pain of confiscation. It had also to pay certain duties imposed by law. What was known as the castle duty was established during February of 1632 at which time a fort at Point Comfort was in the course of erection. The tax consisted of one barrel of powder and ten iron shot. The fort was completed in the autumn of 1632 and the provision as to the amount of powder and a proportionate quantity of shot for every ton represented in its bulk. Three years after this enactment, the number of forts in Virginia increased to five. Source: Hening's Statues, vol. II, pp. 387.
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