His return to Denmark took place late in 1799. A double appointment awaited him at Copenhagen--two government offices, neither bringing in a large salary, but sufficient to allow of his marrying; and accordingly Amelia Behrens became his wife in May 1800. The five following years found him engaged in the civil service at Copenhagen--sometimes in very onerous and uncongenial duties, sometimes in a position of peril, for the bombardment of the city under Nelson took place in 1801, and he keenly entered into every political incident. During this period of five years, his official service was more than once changed, but it seems always to have been connected with finance. He still found time for study, straining every power of his mind, he says, at one time in investigating Roman history, sure 'that the representations of all the moderns, without exception, are but mistaken, imperfect glimpses of the truth.' This Copenhagen life allowed him time but for one visit to his parents; and a disappointment which annoyed him considerably, in what, he thought, a just expectation of preferment, disposed him, in 1806, to accept an offer from the Prussian government of a post at Berlin not unlike that he had occupied in Copenhagen, but promising many advantages in society and literary opportunities. Never was there a more disastrous commencement of a new career. The Niebuhrs reached Berlin in October 5, 1806, and on the 14th came the dreadful battles of Jena and Auerstadt, while Napoleon, with his conquering army, marched rapidly upon the city, and seven of the Prussian ministers gave in their allegiance to the French without even the ceremony of communicating with their king. The new bank-director shared in the general misfortune, and was forced to fly, with the court and ministry, first to Danzig, then to Konigsberg, afterwards to Memel and Riga. A fearful time it was; yet still Niebuhr could write soothingly to his parents: 'You must not be uneasy: I can earn a living either as a scholar or a merchant; and if I do not succeed in one country, I shall in another.' To Mme Hensler also he wrote cheeringly, but under caution, for all letters were unsafe. In the meantime, the indefatigable student took the opportunity of learning Russian and Sclavonic.