sentences:  When Mahon heard that the American Civil War had broken out, he went to fight for the Union.In 1866, he returned to Paris, where he was made a colonel in a regiment of chasseurs by Louis-Napoleon, but in 1877, he moved to Berlin, where he became a close associate of Otto von Bismarck.He was plagued by debts in this period, seeking money in speculative ventures, and in 1871 he returned to Ireland.