the Battle of Glendale (or Frayser's Farm)

"I shall do my best to save the army." --General George McClellan

His claims to the contrary notwithstanding, McClellan had unwittingly placed his army in a very dangerous situation on June 30, 1862. Abandoning his Peninsula campaign and in full retreat toward the James River, McClellan personally boarded a gunboat on the James, leaving his corps strung out on the wooded roads, encumbered with a large baggage train, and without a nominal second-in-command. Robert E. Lee pounced on the opportunity, organizing an elaborate three-prong attack to destroy the Union rearguard. 

Robert E. Lee (left) and Edwin "Bull" Sumner (right)

---