孤军奋战

Explanation: Fighting: make every effort to fight. Helpless army operations against the enemy alone. Also used to refer a person or a collective no support to help efforts in the case of a struggle. 　　Source: "Wei Zhao Xia Biography" Sizu rate of Zhongwang array Peng Pei Ben back, flaws alone Endeavor, single break Sin Ti. "" Sui Yu Qing is passed "by a long-Confucianism alone, the dead Shiba Jiu." Thesaurus:  single-handed; go it alone, weak force, Single-handedly, Alone Antonym Group:  a sure card, of one heart and mind, Many hands make light work., (said of military troops) to enjoy numerical superiority, a large number of mounted and foot soldiers, the broad expanse of the ocean