Hildyard occupied Colenso but was unable to prevent the Boers re-opening fire from Fort Wyllie on the desolate batteries lying on the veld. No troops could move across the open; and only individual efforts could now save the guns. Not a few officers and men offered for the forlorn hope, and at the first attempt two guns were rescued. A later attempt was not successful, and at 11 a.m. Buller ordered a general retirement and the abandonment of the guns. The main naval battery remained in position west of the railway for some hours, and in its presence the Boers were afraid to cross the river and take possession of the derelict but not disabled guns; which were not captured until all the British troops had left the field except a few gunners and infantry details who had taken refuge in the deep donga and whom the order to retreat had not reached; and these were made prisoners of war. The mounted Brigade under Lord Dundonald acting on the right flank with orders to take Hlangwhane, if possible, was too weak to support the main attack effectively. Assistance was refused at first by Barton and afterwards by Buller, who thought that Hlangwhane would be of little use to him without the possession of the Colenso kopjes; yet these could have been enfiladed from it. As the Brigade retired it passed within striking distance of the field guns and their captors; but nothing could be done as ambulances and groups of prisoners were bemingled in the throng. Dundonald seems to have been alone in his recognition of the value of the Hlangwhane position. A retirement to Chieveley and Frere completed the triad of December disasters. Buller, of whom so much was expected, had failed in his first attempt to measure swords with the burghers. His 19,000 men and forty-two guns fighting for six hours inflicted on the enemy a loss of less than two score. His casualties exceeded 1,100, he lost ten guns, and he then returned to the place from which he came. He thought that he had fought a battle, but in reality he had only made a reconnaissance in force, a dangerous operation only justifiable by urgent necessity.[24] Possibly if Buller, who was practically without a staff, had allowed a freer hand to Clery, that authority on Minor Tactics might have done better. It has been said that the defeat was due to insufficient reconnaissance; and this is to a certain extent true, for a more accurate knowledge of the terrain and the dispositions of the enemy would have clearly demonstrated the hopelessness of a frontal attack on the Colenso Kopjes, and the attempt would never have been made. Again, as at Magersfontein four days before, a considerable portion of the troops was not seriously engaged; and the total casualties in eight battalions were but 120.