 Complete the following phrase:  The Crimean War October 1853 to February 1856 was fought by the Russian Empire and an alliance of the Ottoman Empire, France, Britain and Sardinia. Russian fortifications, which included some modern advances, were tested against the latest British and French artillery. At Sevastopol, the focus of the allied effort, the Russians had planned a modern fortress but little work had been done and earthworks were rapidly constructed instead. The largest and most complex earthwork, the Great Redan, was found to be largely resistant to British bombardments and difficult to carry by assault. Only one stone casemated work, the 