Mr. Motley was instructed to withdraw from Vienna in case troops were sent from Austria to Mexico. The embarkation of troops for this purpose was stopped. Austria was in a great state of excitement over the approaching war with Prussia, and, besides needing all her available troops at home, did not care to antagonize the United States.
It was now a question of great interest in this country and in Europe, whether Maximilian would withdraw from Mexico with the French troops or attempt to maintain himself there without foreign support. Napoleon sent one of his aides to Mexico to make known his intentions to Maximilian. This fact was communicated to the United States government, October 16, 1866:
Mr. de Castelnau has for his mission to make it well understood that the limit of our sacrifices is reached and that if the Emperor Maximilian, thinking to find in the country itself a point of sufficient support, may wish to endeavor to maintain himself there, he cannot for the future count on any succor on the part of France. But it may happen that, deeming it impossible to triumph through his own resources over the difficulties which surround him, this sovereign may determine to abdicate. We will do nothing to dissuade him from this, and we think that on this hypothesis there would be ground to proceed, by way of election, in the establishment of a new government.[239]
When the time came for the withdrawal of the first contingent of French troops, no action to that end was taken by the French government, and the United States had once more to seek an explanation. The Emperor assured the American government, however, that he had decided from military considerations to withdraw all his troops in the spring in a body, as the recent successes of the insurgents would render any large reduction of his forces perilous to those who remained. He further stated that he had counselled Maximilian to abdicate.[240] To the surprise of everyone, however, Maximilian seemed to think that honor demanded that he should remain in Mexico and share the fate of his supporters.
After the withdrawal of Mr. Corwin, owing to the unsettled state of affairs in Mexico, the United States had no one accredited to that government until May, 1866, when Mr. Lewis D. Campbell, of Ohio, was appointed. He left New York for his post in November, 1866, accompanied by Lieutenant General William T. Sherman of the army. They proceeded in the U. S. S. Susquehanna by way of Havana, but as they found the principal Mexican ports on the Atlantic still occupied by the French, they proceeded to New Orleans, from which point Mr. Campbell tried to establish regular communication with President Juarez. The President had first decided to dispatch General Grant with Mr. Campbell, in the hope "that some disposition might be made of the land and naval forces of the United States without interfering within the jurisdiction of Mexico, or violating the laws of neutrality, which would be useful in favoring the restoration of law, order and republican government in that country." This demonstration was intended to insure the withdrawal of the French army according to the promises of the Emperor. A hitch occurred through some question raised by General Grant and General Sherman was substituted.[241]
The French army was withdrawn in the spring of 1867, and it very soon became evident that Maximilian's cause would speedily collapse. In view of the almost inevitable capture of Maximilian, Mr. Seward telegraphed to Mr. Campbell at New Orleans, April 6, 1867:
You will communicate to President Juarez, promptly and by effectual means, the desire of this government, that in case of capture, the prince and his supporters may receive the humane treatment accorded by civilized nations to prisoners of war.
Some of the prisoners already taken had been summarily executed.
Mr. Campbell at once dispatched a special messenger, who succeeded in getting through to the headquarters of Juarez, and who returned with an answer from the Mexican government, dated April 22, 1867. This answer not only undertook to defend the execution of prisoners above referred to, but also intimated that similar severity would be practiced on Maximilian and his leading associates, if captured, on the ground that, by his harsh decrees, he had placed himself beyond the pale of the law of nations.[242]
Maximilian and his chief supporters were taken prisoners, May 15, 1867. This information was received in the United States toward the last of the month, and along with it a report, not well authenticated and which afterward proved to be false, that they had been executed on the 16th. As soon as these rumors reached Washington, Mr. Seward telegraphed to Mr. Campbell, then at New Orleans, June 1, 1867, directing him to proceed at once to the residence of the President of Mexico and enter on his mission, and if necessary to urge clemency to Maximilian and the other prisoners of war. Mr. Campbell failed to act under these instructions. He requested first that a public vessel of the United States should be detailed to carry him to Mexico. When it was found that no ship was available for this purpose, he was ordered to proceed to Havana and thence by the British or French line of steamers to Vera Cruz. He replied that under the circumstances he did not think it becoming the dignity of the representative of the United States to return to Mexico under the flag of a nation which had shown such hostility to that country. He thus remained at New Orleans from the first to the fifteenth of June. He was then ordered peremptorily to proceed at once according to instructions. He replied that he was ill and was afraid to go by way of Havana, where yellow fever was raging; that he would resign, if desired. The same day Mr. Seward telegraphed him that his resignation would be accepted.