Summary

Portrait of Salmon P. Chase Salmon P. Chase The Peterhoff — Opinion of the Court

They assert principles without disregard of which it is impossible to hold that inland trade from Matamoras, in Mexico, to Brownsville or Galveston, in Texas, or from Brownsville or Galveston to Matamoras, was affected by the blockade of the Texan coast.
And the general doctrines of international law lead irresistibly to the same conclusion. We know of but two exceptions to the rule of free trade by neutrals with belligerents: the first is that there must be no violation of blockade or siege; and the second, that there must be no conveyance of contraband to either belligerent.
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Portrait of Salmon P. Chase Salmon P. Chase The Peterhoff — Opinion of the Court

We must say, therefore, that trade, between London and Matamoras, even with intent to supply, from Matamoras, goods to Texas, violated no blockade, and cannot be declared unlawful.
Trade with a neutral port in immediate proximity to the territory of one belligerent, is certainly very inconvenient to the other. Such trade, with unrestricted inland commerce between such a port and the enemy's territory, impairs undoubtedly and very seriously impairs the value of a blockade of the enemy's coast.
Source: Wikisource

Portrait of Salmon P. Chase Salmon P. Chase The Peterhoff — Opinion of the Court

Our own country and other countries have participated in it without hindrance alike; and having done so in a manner that gave notice to the world that this course of commerce was free, how can our government set up the right of capture? In truth the government has been placed in an awkward position by the act of the naval forces now under consideration, and its law officers will add to the awkwardness of its position by endeavoring to justify the captors; a thing impossible, we think, when the controlling circumstances of the case are considered.
Source: Wikisource

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