A Russian army of forty thousand veterans was already assembled in occupied Prussian Pomerania, and Peter, without waiting to arrive himself, ordered these troops to advance. The Danes reacted by moving first and met the Russians in Mecklenburg. Then, to the astonishment of Danish commanders, the Russians in front of them began to retreat. The riddle was solved a few days later. There had been a coup d’état in St. Petersburg. Peter III had been overthrown, had abdicated, and was a prisoner. Peter’s wife, now styled Catherine II, had been proclaimed empress of Russia.
