By day four, 20 September, the brigade still holding out at the bridge had been split into two groups during the night by the Germans who had managed to infiltrate close enough to separate them into positions east and west of the bridge road. Any movement was subjected to machine-gun and sniper fire and they were under almost constant mortar and artillery attack. Added to this were probes by tanks and self propelled guns, which approached the defenders' buildings and opened fire at point blank range. The brigade, out of anti-tank ammunition, could do nothing to stop them in the east, but the 6 pounders in the west still proved an effective deterrent. During the day, Lieutenant John Grayburn of the 2nd Battalion was killed and later posthumously awarded the Victoria Cross for his bravery during the fighting at the bridge. That morning, communications with 1st Airborne Division were established and Frost, on asking for reinforcements and supplies, was informed that the division was surrounded at Oosterbeek and the brigade was on their own. Frost was later wounded and command of the brigade assumed by Major Frederick Gough of the reconnaissance squadron. By midday the brigade position was untenable and the last defenders were withdrawn into what had been the Headquarters Company, 2nd Battalion's position. By nightfall they were still holding out, and in the darkness some men tried unsuccessfully to break out. At dawn on day five, what was left of the brigade was forced to surrender.