O banks of the Rhine! We have seen you covered with gore, inasmuch as the swords of retribution were drawn against you; and you shall have another turn. And We hear the lamentations of Berlin, though she be today in conspicuous glory.

the one whose power transcended thy power, and whose station excelled thy station
This is a reference to Napoleon III (1808-1873), the Emperor of the French, who was regarded by many historians as the most outstanding monarch of his day in the West.
Bahá’u’lláh addressed two Tablets to Napoleon III, in the second of which He clearly prophesied that Napoleon’s kingdom would be “thrown into confusion”, that his “empire shall pass” from his hands, and that his people would experience great “commotions”.
Within a year, Napoleon III suffered a resounding defeat, at the hands of Kaiser William I, at the Battle of Sedan in 1870. He went in exile to England, where he died three years later.

O banks of the Rhine!
In one of His Tablets written before the First World War (1914-1918), ‘Abdu’l-Bahá explained that Bahá’u’lláh’s reference to having seen the banks of the Rhine "covered with gore" related to the Franco-Prussian War (1870-1871), and that there was more suffering to come.
In God Passes By Shoghi Effendi states that the "oppressively severe treaty" that was imposed on Germany following its defeat in the First World War "provoked 'the lamentations of Berlin' which half a century before, had been ominously prophesied".