in May 1935 , the Red Army first Army broke through the enemy The defense came to the Dadu River ferry . Dadu natural conditions sinister difficult to pass , tens of thousands of troops . The enemy soldiers chasing after , the former natural barrier blocking the road , our military has decided to against all odds to win the Dadu River upstream of the Luding Bridge crossing , in order to maintain armies to cross the river . The avant-garde camp of the Red Army through thick and thin , tenacious battle won Luding Bridge, and the laying of the concrete slab , the Red Army troops to safely cross the river to continue marching to the Snowy Mountains . In the process of moving snow-capped mountains , the weather was extremely bad , many soldiers have died in the Snowy Mountains or our army to conquer . In August 1935 , the victory of the red one and the Red Army joined forces , the army to move on . Injured in Dadu fighting instructor Li Youguo picking up an injury crisis situation , the landlord uncle own only one horse gave the Red Army . Grass march hard exception , the heads of killed the horses given to the soldiers to eat , Li Youguo optimistic and positive attitude to encourage everyone , until the last moment of life . The Red Army finally out of the grass , soldiers bang defeated the Kuomintang Ma Pu-fang , the army came to attack , then, quickly break through the natural barrier of the enemy heavily guarded Lazikou . December 1936 , after a thousand difficulties , the Red Army finally in northern Shaanxi victory with the Red 15th Corps joined forces to complete the twenty-five thousand epic Long March .