Lincoln’s diversion of McDowell’s corps to chase Jackson was probably a strategic error—perhaps even the colossal blunder that McClellan considered it. But if Union commanders in the Valley had acted with half the energy displayed by Jackson they might well have trapped and crippled Jackson’s army. And even if McDowell’s corps had joined McClellan as planned, the latter’s previous record offered little reason to believe that he would have moved with speed and boldness to capture Richmond.
