It must not be supposed, however, that either Ashburton or Webster sacrificed the claims of his own Government. Webster certainly was a good attorney for the United States in settling the boundary disputes, as is shown by the battle of the maps. The territorial contentions of both countries hung largely upon the interpretation of certain clauses of the first American treaty of peace. Webster therefore ordered a search for material to be made in the archives of Paris and London. In Paris there was brought to light a map with the boundary drawn in red, possibly by Franklin, and supporting the British contention. Webster refrained from showing this to Ashburton and ordered search in London discontinued. Ironically enough, however, a little later there was unearthed in the British Museum the actual map used by one of the British commissioners in 1782, which showed the boundary as the United States claimed it to be. Though they had been found too late to affect the negotiations, these maps disturbed the Senate discussion of the matter. Yet, as they offset each other, they perhaps facilitated the acceptance of the treaty. Rapidly Webster and Ashburton cleared the field. Webster obtained the release of McLeod and effected the passage of a law to prevent a similar crisis in the future by permitting such cases to be transferred to a federal court. The Caroline affair was settled by an amicable exchange of notes in which each side conceded much to the other. They did not indeed dispose of the slave trade, but they reached an agreement by which a joint squadron was to undertake to police efficiently the African seas in order to prevent American vessels from engaging in that trade. Upon the more important matter of boundary, both Webster and Ashburton decided to give up the futile task of convincing each other as to the meaning of phrases which rested upon half-known facts reaching back into the misty period of first discovery and settlement. They abandoned interpretation and made compromise and division the basis of their settlement. This method was more difficult for Webster than for Ashburton, as both Maine and Massachusetts were concerned, and each must under the Constitution be separately convinced. Here Webster used the "Red Line" map, and succeeded in securing the consent of these States. They finally settled upon a boundary which was certainly not that intended in 1782 but was a compromise between the two conceptions of that boundary and divided the territory with a regard for actual conditions and geography. From Passamaquoddy Bay to the Lake of the Woods, accepted lines were substituted for controversy, and the basis of peace was thus made more secure. The treaty also contained provision for the mutual extradition of criminals guilty of specified crimes, but these did not include embezzlement, and "gone to Canada" was for years the epitaph of many a dishonest American who had been found out.