To the right of this sector and north of the Menin road, there was fierce fighting throughout the day when the British drove the enemy from all positions and made secure the flank of their principal advance. Australian troops fighting farther south swept the Germans from Polygon Wood and won a trench position to the east of it. Near Tower Hamlets an important height that had been much fought over was won by British forces, who also occupied strong field works on the eastern slope. On the left of the main attack there was an advance of about half a mile along the road to Gravenstafel. For days the Germans had been bringing up reenforcements in anticipation of the British offensive. The German command, appreciating the importance of the elevated positions, had given orders to their troops to hold fast at whatever loss of life. The British consequently encountered everywhere a desperate resistance, especially on the right of the offensive around Tower Hamlets Ridge west of Gheluvelt. In the course of the afternoon and evening the Germans projected seven powerful counterattacks against positions the British had captured east of Ypres, but were unable to shake the victors' bulldog grip. Here and there the Germans were successful in capturing a redoubt, but were only able to hold it for a short time before being thrust out by a well-directed counterattack. In this offensive the British captured 1,614 Germans, of whom forty-eight were officers. The result of this British drive was to remove almost the last cover for the Germans between their advanced line in Flanders and the Ostend-Lille railway, their principal means of communication and of supplies in this part of Belgium. Parts of this line could be clearly seen from Zonnebeke Heights and within easy reach of the British guns, six miles away. While the British were gaining ground their naval aeroplanes were attacking this line from the sky, dropping tons of explosives on the Thourout and Roulers junctions and on the German base at Ostend. The last British advance of a mile had brought this important objective almost within reach. Its capture would result in the evacuation of Belgium as far as the Scheldt and free the French cities of Lille, Roubaix, and Tourcoing. The Germans continued to counterattack and bombard British positions that had been won during the advance, but they were unable to score any permanent successes. The net result of the fighting in the Ypres area was the capture by the British of 5,296 prisoners, including 146 officers. They had also taken during the month eleven guns, including heavy pieces, 377 machine guns, and fifty-seven trench mortars.