Such a system, however, would have the effect of turning the castle of St.Angelo into another Tower of Babel.

Besides, the affairs of this world are not all regulated according to the principles of logic.
The only three Powers which contributed to the re-establishment of Pius IX.

were France, Austria, and Spain.

The French besieged Rome; the Austrians seized the places of the Adriatic; the Spaniards did very little, not from the want either of goodwill or courage, but because their allies left them nothing to do.
If a private individual may be permitted to probe the motives upon which princes act, I would venture to suggest that the Queen of Spain had nothing in view but the interests of the Church.

Her soldiers came to restore the Pope to his throne; they went as soon as he was reseated on it.