In consequence, when the next overt act of insurrection occurred, at Cadiz, on September 17, there was a very general response throughout the Kingdom. General Prim was again at the head of the movement, supported by General Serrano and the other officers, to whom the sentence of banishment had not proved effective, since they had found their way back into Spain. Revolutionary Juntas were formed in almost all of the provinces, and in a number of the most important cities, and in the course of a few days the insurgents were in control of a considerable part of the Kingdom.
The City of Santander was seized for the revolution on September 21, but they were obliged to relinquish it to superior forces on September 24. However, the revolutionists were far from discouraged by this momentary reverse, and four days later they rallied for their first important victory, which was followed by a general revolt of the troops in and about Madrid, and General Concha, the commander of the royal forces, was compelled to resign. The revolution was now in full swing and gaining impetus and strength every hour. General Serrano at the head of a revolutionary army entered Madrid in triumph, followed four days later by General Prim. Their reception exceeded their wildest expectations. The city was on fire with revolt. The people greeted them with the warmest fervor, with shouts of welcome and rejoicing. They were hailed as the saviors of the nation, as the embodiment of Spain's hope for the future, and hourly their forces were increased by the addition of volunteers from all walks of life.
It is evident that Queen Isabella had not found Madrid a comfortable abiding place. There is no doubt that she entertained fears for her personal safety long before it was actually in jeopardy. Some time previous to these happenings she had, on some pretext, removed the court from Madrid to San Sebastian, in the Pyrenees, near the French frontier, and when news of the capture of the Spanish capital reached her, she lost no time in making her escape across the frontier into France, where she was met and welcomed by Emperor Napoleon III, at Hendye. Queen Isabella had good reason to fear the vengeance of the Spanish mob, for she had long been unpopular, an object of widespread hatred. She therefore had no intention of returning to Spain while matters were in such a turbulent condition, and shortly after her arrival in France, she proceeded to Paris, where she decided to make her home.