Statistics for occurrence #1 of “Gen. Heintzelman” in chapter 30 of Elias Nason, McClellan's Own Story: the war for the union, the soldiers who fought it, the civilians who directed it, and his relations to them.:

... On the 26th I received the following from Gen. Halleck: There is reason to believe that the enemy is moving a large force into the Shenandoah Valley. Reconnoissances will soon determine. Gen. Heintzelman 's corps was ordered to report to Gen. Pope, and Kearny's will probably be sent to-day against the enemy's flank. Don't draw any troops down the Rappahannock at present; we shall probably want them ...
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