However , there is disagreement in other sources over the incident .
Harrison E. Salisbury 's The Long March : The Untold Story and Charlotte Salisbury 's Long March Diary mention a battle at Luding Bridge , but they relied on second - hand information .
There is disagreement in other sources over the incident .
Harrison E. Salisbury 's The Long March : The Untold Story and Charlotte Salisbury 's Long March Diary mention a battle at Luding Bridge , but they relied on second - hand information .