COMBINED OPERATIONS 5. Before the Germans can stage any combined operations against Caucasia they must destroy the Russian Black Sea fleet. This is at present based on NOVOROSSISK, TUAPSE, POTI AND BATUM. It remains possible, however, for the Germans to stage combined operations from Eastern Crimea across the Kerch Strait, or from the mainland across the Sea of Azov as a subsidiary to any advance south from Rostova. Enemy shipping at present in the Black Sea is insufficient to lift more than one division and would require to be supplemented from the Mediterranean.