 Complete the following phrase:  Originally formed by Zeng Sheng  in Guangdong in 1939, this group mainly comprised peasants, students, and seamen, including Yuan Geng. When the war reached Hong Kong in 1941, the guerrilla force grew from 200 to more than 6,000 soldiers. In January 1942, the Guangdong peoples anti-Japanese East River guerrillas  was established to reinforce anti-Japanese forces in Dongjiang and Zhujiang Pearl River deltas. The guerillas most significant contribution to the Allies, in particular, was their rescue of twenty American pilots who parachuted into Kowloon when their planes were shot down by the Japanese. In the wake of the 