1. Letter, Brigadier General H.E. Elliott to Captain C.E.W. Bean 15 May 1929 describes one such truce, 1DRL264/1B:

"When we took over, the 58th Battalion was told by the Guards  Division whom they relieved that they had come to a tacit understanding with the enemy not to fire on each other since if they did neither side could get food up.  The next day after the relief General Birdwood met a slightly wounded man of the 58th and asked him if he had met any Germans. His reply was he saw dozens of them but was not allowed to shoot at them. Birdwood came to my HQ in a furious rage and asked me how I dared to issue such an order. Of course, I denied doing so and made inquiries which elicited the truth and no more was heard of the complaint. But in consequence of General Birdwood's action the truce was declared off and every Hun seen was fired on. This naturally brought retaliation and we had the worst of the deal owing to the long carry."