Meanwhile the greatest and wisest of Louis' ministers, Colbert, was diligently building up that system of administration, which, by increasing and solidly basing the wealth of the State, should bring a surer greatness and prosperity than the king's more showy enterprises. With those details that concern the internal development of the kingdom this history has no concern, beyond the incidental mention that production, both agricultural and manufacturing, received his careful attention; but upon the sea a policy of skilful aggression upon the shipping and commerce of the Dutch and English quickly began, and was instantly resented. Great trading companies were formed, directing French enterprise to the Baltic, to the Levant, to the East and West Indies; customs regulations were amended to encourage French manufactures, and to allow goods to be stored in bond in the great ports, by which means it was hoped to make France take Holland's place as the great warehouse for Europe, a function for which her geographical position eminently fitted her; while tonnage duties on foreign shipping, direct premiums on home-built ships, and careful, rigorous colonial decrees giving French vessels the monopoly of trade to and from the colonies, combined to encourage the growth of her mercantile marine. England retaliated at once; the Dutch, more seriously threatened because their carrying-trade was greater and their home resources smaller, only remonstrated for a time; but after three years they also made reprisals. Colbert, relying on the great superiority of France as an actual, and still more as a possible producer, feared not to move steadily on the grasping path marked out; which, in building up a great merchant shipping, would lay the broad base for the military shipping, which was being yet more rapidly forced on by the measures of the State. Prosperity grew apace. At the end of twelve years everything was flourishing, everything rich in the State, which was in utter confusion when he took charge of the finances and marine. "Under him," says a French historian, "France grew by peace as she had grown by war.... The warfare of tariffs and premiums skilfully conducted by him tended to reduce within just limits the exorbitant growth of commercial and maritime power which Holland had arrogated at the expense of other nations; and to restrain England, which was burning to wrest this supremacy from Holland in order to use it in a manner much more dangerous to Europe. The interest of France seemed to be peace in Europe and America; a mysterious voice, at once the voice of the past and of the future, called for her warlike activity on other shores."[19]