 After Christmas 1914 , sporadic attempts were made at seasonal truces ; a German unit attempted to leave their trenches under a flag of truce on Easter Sunday 1915 , but were warned off by the British opposite them , and later in the year , in November , a Saxon unit briefly <unk> with a Liverpool battalion . In December 1915 , there were explicit orders by the Allied commanders to forestall any repeat of the previous Christmas truce . Individual units were encouraged to mount raids and harass the enemy line , whilst communicating with the enemy was discouraged by artillery barrages along the front line throughout the day . The prohibition was not completely effective , however , and a small number of brief truces occurred . 
