But the time came at the close of the French War when the mercantile system was subordinated to a revenue system, and the enforcement of the navigation laws and acts of trade, made more stringent by some new ones, became the policy of the government. Its instruments were admiralty courts with enlarged jurisdiction, commissioners of customs, writs of assistance, and an adequate naval force. When that time came, the Revolution was not far off![26] In 1755, Shirley, then governor of Massachusetts, had persuaded the General Court to attempt by a stamp act to meet the expenses of the French War. This produced an irritation like that which followed in 1765 the act of the British ministry;[27] and to Shirley, as much as to any other man, perhaps, was due the suggestion of those parliamentary measures which led to the Revolution. Long residence in Boston and his profession as a lawyer had made him familiar with the evasions of the navigation laws; and his larger duties as commander-in-chief, in which he found much difficulty in bringing the colonial assemblies into concerted and efficient action, doubtless suggested measures which were adopted by the British ministry. However this may have been, the enforcement of the navigation laws was taken in hand for the first time by the government, and no longer left to depend upon private interests. This unwonted activity was shown as early as 1754. Its most formidable weapon was the Writ of Assistance. More than four years before the passage of the Stamp Act, James Otis had resisted the granting of these writs before the Superior Court of Massachusetts. John Adams, then a student of law, took notes of Otis's argument, and fifty-six years later wrote: "Then and there was the first scene of the first act of opposition to the arbitrary claims of Great Britain. Then and there the child Independence was born."[28] This was no mere rhetorical phrase.[29] The influence of this controversy in producing the Revolution is not wholly due to the fiery eloquence of Otis, whose words, said John Adams, "breathed into the nation the breath of life", nor to the range of his argument, which called in question the mercantile and political systems of Great Britain, but to their effect upon the commercial interest—then the leading one—of New England; for if the latent powers of these writs were set free, and used by the revenue officers, the commerce of Boston, Salem, and Newport would have been effectually crippled. Authorized in England, they were extended to the colonies by an act of William III.[30] The officers of customs, however, instead of applying to the courts for them, relied upon the implied powers of their commissions, and forcibly entered warehouses for contraband goods. The people grew uneasy, and some stood upon their rights against the officers, whose activity was stimulated by documents like that given in the note below.[31]