On the other hand, the representatives of the United States insisted upon our treaties and the obligations of neutrality. Polk's annual Message of December, 1846, denounced the Mexican plan as inviting "all the freebooters upon earth," who felt like paying for the privilege, to cruise against American commerce, announced that our own courts would say whether such papers could protect them from the pirate's doom, recommended that Congress provide at once for the trial of Spanish subjects caught in such business, and suggested American privateers--intended mainly to recapture vessels taken under Mexican letters. An American force hastened to the Mediterranean, and our squadrons were expected to seize all the rovers putting out, as well as intercept all prizes on their way to the enemy's ports. These precautions looked rather discouraging to enterprising desperadoes.[30.6] In England there was a feeling, as will appear later, that Mexico should be allowed the utmost license against us, and the Mexican minister at London received many applications for letters; but Great Britain did not really wish her supplies of cotton to be endangered, and all the seas to be filled with corsairs preying upon the trade of the world; and in October, 1845, her minister to Mexico was instructed to prevent that country, if he could, from issuing letters of marque indiscriminately. Bankhead protested also, as did the Spanish minister, against important features of the regulations. Palmerston himself, though he acted in a languid fashion, and gave notice at Washington that British subjects, found on Mexican privateers, could not be treated as pirates, announced that his government would faithfully do its duty.[30.7] France was prompt and active in responding to our demands. Spain, placed under stringent obligations by the treaty of October, 1795, promised full compliance with its requirements, captured _El Unico_, punished its crew, pursued _La Rosita_, and ordered O'Donnell, the captain general of Cuba, to act as her obligations required; but she accepted Pareda, the colporteur of what was piracy under her agreement, as consul of Mexico; and the captain general, while he convinced the American representative of his good-will and in fact would not permit an open violation of the treaty, suggested to the Mexicans ways--fortunately impracticable--of evading his own rules. But the risks of privateering under so many embarrassments and the virtual impossibility of converting a prize into cash, prevented all attempts except the feeble ones already mentioned. In this field, consequently, our navy, though incessantly watchful, could acquire no laurels.[30.7] [THE BLOCKADE]