Jackson altered Union perceptions first by his bold attack on Kernstown, which made Lincoln and McClellan think he had more troops than he did—they could not imagine that anyone would be so stupid as to send only 3,600 men against a Union stronghold. If Jackson was stronger than they had imagined, that meant they needed more men in the Shenandoah Valley, which cut into the troops available for the march on Richmond. Next Jackson began behaving unpredictably, creating the impression of having not only a large army but also some strange and worrying plan. Lincoln’s and McClellan’s inability to
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