The campaign of 1761 was almost as abortive as the campaign of 1760. Frederick acted on the defensive with consummate skill, and the capture of the Prussian fortress of Kolberg on Christmas Day 1761, by Rumyantsev, was the sole Russian success. Frederick, however, was now at the last gasp. On 6 January 1762, he wrote to Count Karl-Wilhelm Finck von Finckenstein, "We ought now to think of preserving for my nephew, by way of negotiation, whatever fragments of my territory we can save from the avidity of my enemies." A fortnight later, he wrote to Prince Ferdinand of Brunswick, "The sky begins to clear. Courage, my dear fellow. I have received the news of a great event." The Miracle of the House of Brandenburg that snatched him from destruction was the death of the Russian empress, on 5 January 1762 (N.S.).