1947年，国民党军队胡宗南等部25万人的兵力，向延安发动突然袭击，在陕北的仅两万人的人民军队进行了六昼夜阻击战，掩护党中央机关和人民群众安全转移。图为毛泽东在转战陕北途中。（新华社发）

This undated photo shows Mao Zedong (C) rides a horse on his way to the north part of Shaanxi, northwest China, after the KMT’s Hu Tsung-nan troop made a dawn swoop in Yan’an in 1947. PLA troop succeeded in covering the CPC Central Committee organs and the people to transfer to safer place with only 20 thousand people against KMT’s 250 thousand-people troop. （Xinhua Photo）