 Complete the following phrase:  The epitome of his career was the Russo-Turkish War, 18771878, when Nicholas Nicolaievich was appointed Commander-in-Chief of the Russian armies of the Danube, although his reputation as a strategist was very low. The Grand Duke had no particular distinction in early successes in the conflict and these were followed by terrible reverses of the armies under his orders. After the expulsion of the Russian troops from Rumelia and unsuccessful attacks at 