The latter part of June I repaired to Brownsville myself to impress the Imperialists, as much as possible, with the idea that we intended hostilities, and took along my chief of scouts--Major Young--and four of his most trusty men, whom I had had sent from Washington. From Brownsville I despatched all these men to important points in northern Mexico, to glean information regarding the movements of the Imperial forces, and also to gather intelligence about the ex-Confederates who had crossed the Rio Grande. On information furnished by these scouts, I caused General Steele to make demonstrations all along the lower Rio Grande, and at the same time demanded the return of certain munitions of war that had been turned over by ex-Confederates to the Imperial General (Mejia) commanding at Matamoras. These demands, backed up as they were by such a formidable show of force created much agitation and demoralization among the Imperial troops, and measures looking to the abandonment of northern Mexico were forthwith adopted by those in authority--a policy that would have resulted in the speedy evacuation of the entire country by Maximilian, had not our Government weakened; contenting itself with a few pieces of the contraband artillery varnished over with the Imperial apologies. A golden opportunity was lost, for we had ample excuse for crossing the boundary, but Mr. Seward being, as I have already stated, unalterably opposed to any act likely to involve us in war, insisted on his course of negotiation with Napoleon.
As the summer wore away, Maximilian, under Mr. Seward's policy, gained in strength till finally all the accessible sections of Mexico were in his possession, and the Republic under President Juarez almost succumbed. Growing impatient at this, in the latter part of September I decided to try again what virtue there might be in a hostile demonstration, and selected the upper Rio Grande for the scene of my attempt. Merritt's cavalry and the Fourth Corps still being at San Antonio, I went to that place and reviewed these troops, and having prepared them with some ostentation for a campaign, of course it was bruited about that we were going to invade Mexico.
Then, escorted by a regiment of horse I proceeded hastily to Fort Duncan, on the Rio Grande just opposite the Mexican town of Piedras Negras. Here I opened communication with President Juarez, through one of his staff, taking care not to do this in the dark, and the news, spreading like wildfire, the greatest significance was ascribed to my action, it being reported most positively and with many specific details that I was only awaiting the arrival of the troops, then under marching orders at San Antonio, to cross the Rio Grande in behalf of the Liberal cause.
Ample corroboration of the reports then circulated was found in my inquiries regarding the quantity of forage we could depend upon getting in Mexico, our arrangements for its purchase, and my sending a pontoon train to Brownsville, together with which was cited the renewed activity of the troops along the lower Rio Grande. These reports and demonstrations resulted in alarming the Imperialists so much that they withdrew the French and Austrian soldiers from Matamoras, and practically abandoned the whole of northern Mexico as far down as Monterey, with the exception of Matamoras, where General Mejia continued to hang on with a garrison of renegade Mexicans.
The abandonment of so much territory in northern Mexico encouraged General Escobedo and other Liberal leaders to such a degree that they collected a considerable army of their followers at Comargo, Mier, and other points. At the same time that unknown quantity, Cortinas, suspended his free-booting for the nonce, and stoutly harassing Matamoras, succeeded in keeping its Imperial garrison within the fortifications. Thus countenanced and stimulated, and largely supplied with arms and ammunition, which we left at convenient places on our side of the river to fall into their hands, the Liberals, under General Escobedo--a man of much force of character--were enabied in northern Mexico to place the affairs of the Republic on a substantial basis.
But in the midst of what bade fair to cause a final withdrawal of the foreigners, we were again checked by our Government, as a result of representations of the French Minister at Washington. In October, he wrote to Mr. Seward that the United States troops on the Rio Grande were acting "in exact opposition to the repeated assurances Your Excellency has given me concerning the desire of the Cabinet at Washington to preserve the most strict neutrality in the events now taking place in Mexico," and followed this statement with an emphatic protest against our course. Without any investigation whatever by our State Department, this letter of the French Minister was transmitted to me, accompanied by directions to preserve a strict neutrality; so, of course, we were again debarred from anything like active sympathy.
