The Tagliamento could, however, be easily turned from the north, and the Italian retreat continued across the Livenza and the Piave where Cadorna stood on 10 November. The Adige farther south was considered by many to be Italy's real strategic frontier, but the abandonment of the Piave would surrender Venice to the enemy, and Venice was Italy's one naval base in the northern Adriatic. It must be retained, or the Italian Fleet would have to withdraw to Brindisi and leave the Adriatic and Italy's eastern coast open to incursion from Pola. But if the Piave was to be held, the German threat to turn it by a descent from the Alps down either side of the Brenta valley must be defeated; and it was here that the Caporetto campaign was fought to a standstill in November and December. Fortunately Ludendorff had not been prepared for the magnitude of his own success, and Von Buelow's thirteen divisions had not been cast for the part of destroying the Italian armies. Their object had been twofold, firstly to compel France and Great Britain to weaken their front by sending aid to Italy, and secondly, to secure plunder in the shape of guns, munitions, and corn-growing territory. The Kaiser boasted that his armies had been set up for some time by this Italian success, and Italy's two Allies had no choice but to send divisions to her assistance, the French under Fayolle and the British under Plumer. With that the Germans were content, and although the Austrians continued their efforts to force the Piave and turn its flank down the Brenta valley, Von Buelow's six German divisions took little part in the fighting and were soon with their general sent back to the Western front.