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In page Battle of the Little Bighorn:

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The historian James Donovan believed that Custer's dividing his force into four smaller detachments (including the pack train) can be attributed to his inadequate reconnaissance; he also ignored the warnings of his Crow scouts and Charley Reynolds.[4] By the time the battle began, Custer had already divided his forces into three battalions of differing sizes, of which he kept the largest. His men were widely scattered and unable to support each other.[5][6] Wanting to prevent any escape by the combined tribes to the south, where they could disperse into different groups,[7] Custer believed that an immediate attack on the south end of the camp was the best course of action.[citation needed]