Re Arnhem.....this is from an account of day 3 of the battle....long after the Division had been fractured and was largely out of supply...
At 3:00 a.m., the commanders of the 2nd battalion and the 1st and 11th parachute battalions met to plan their attack. At 4:30 a.m., before dawn, the 1st Parachute Brigade began its attack towards Arnhem Bridge, with the 1st Battalion leading supported by remnants of the 3rd Battalion, with the 2nd South Staffordshires on the 1st Battalion's left flank and the 11th Battalion following. As soon as it became light the 1st Battalion was spotted and halted by fire from the main German defensive line. Trapped in open ground and under heavy fire from three sides, the 1st Battalion disintegrated and what remained of the 3rd Battalion fell back. The 2nd South Staffordshires were similarly cut off and, save for about 150 men, overcome by midday. The 11th Battalion, (which had stayed out of much of the fighting) was then overwhelmed in exposed positions while attempting to capture high ground to the north. With no hope of breaking through, the 500 remaining men of these four battalions withdrew westwards in the direction of the main force, 5 km (3.1 mi) away in Oosterbeek.
Such attacks would be impossible using the traffic light system as the forces would have been red or amber.
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