On the 6th of June last, in violation of our neutrality laws, a military expedition and enterprise against the British North American colonies was projected and attempted to be carried on within the territory and jurisdiction of the United States. In obedience to the obligation imposed upon the Executive by the Constitution to see that the laws are faithfully executed, all citizens were warned by proclamation against taking part in or aiding such unlawful proceedings, and the proper civil, military, and naval officers were directed to take all necessary measures for the enforcement of the laws. The expedition failed, but it has not been without its painful consequences. Some of our citizens who, it was alleged, were engaged in the expedition were captured, and have been brought to trial as for a capital offense in the Province of Canada. Judgment and sentence of death have been pronounced against some, while others have been acquitted. Fully believing in the maxim of government that severity of civil punishment for misguided persons who have engaged in revolutionary attempts which have disastrously failed is unsound and unwise, such representations have been made to the British Government in behalf of the convicted persons as, being sustained by an enlightened and humane judgment, will, it is hoped, induce in their cases an exercise of clemency and a judicious amnesty to all who were engaged in the movement. Counsel has been employed by the Government to defend citizens of the United States on trial for capital offenses in Canada, and a discontinuance of the prosecutions which were instituted in the courts of the United States against those who took part in the expedition has been directed.