sentences:  The British noted how ferociously the Chinese volunteers in Dalforce fought, earning them the nickname "Dalley's Desperadoes".Dalley had suggested creating a guerrilla network in 1940, but it was not until about a year later, when the Japanese invasion was imminent, did it become apparent that the official recruitment of the local Chinese against the Japanese was essential.The British Government relented and on 25 December 1941, Dalforce was officially established, ignoring the fact that the existing Singapore Overseas Chinese Anti-Japanese Volunteer Army had been in existence under Chinese leadership since at least 1939.