troops to the river at Edwards Ferry, positioned other forces along the river, had his artillery fire into suspected Confederate positions, and briefly crossed about a hundred men of the 1st Minnesota to the Virginia shore just before dusk. Having gotten no reaction from Colonel Evans with all of this activity, Stone recalled his troops to their camps and the "slight demonstration" came to an end. Stone then ordered Colonel Charles Devens of the 15th Massachusetts Infantry, stationed on Harrison's Island, facing Ball's Bluff, to send a patrol across the river at that point to gather what information it could about enemy deployments. Devens sent Captain Chase Philbrick and approximately 20 men to carry out Stone's order. Advancing in the dark nearly a mile inland from the bluff, the inexperienced Philbrick mistook a row of trees for the tents of a Confederate camp and, without verifying what he saw, returned and reported the existence of a camp. Stone immediately ordered Devens to cross some 300 men and, as soon as it was light enough to see, attack the camp and, per his orders, "return to your present position." This was the genesis of the Battle of Ball's Bluff. Contrary to the long-held traditional interpretation, it did not come from a plan by either McClellan or Stone to take Leesburg. The initial crossing of troops was a small reconnaissance. That was followed by what was intended to be a raiding party. To make matters worse, Stone was not advised that McCall and his division had been ordered back to Washington. Opposing forces Union Confederate Battle On the morning of October 21, Colonel Devens' raiding party discovered the mistake made the previous evening by the patrol; there was no camp to raid. Opting not to recross the river immediately, Devens deployed his men in a tree line and sent a messenger back to report to Stone and get new instructions. On hearing the messenger's report, Stone sent him back to tell Devens that the remainder of the 15th Massachusetts (another 350 men) would cross the river and move to his position. When they arrived, Devens was to turn his raiding party back into a reconnaissance and move toward Leesburg. While the messenger was going back to Col. Devens with this new information, Colonel and U.S. Senator Edward Dickinson Baker showed up at Stone's camp to find out about the morning's events. He