Meanwhile, Nathanael Greene's column on Limekiln Road had finally caught up with the bulk of the Americans at Germantown. Greene's vanguard engaged the British pickets at Luken's Mill, driving them back after a savage skirmish. The fog that clung to the field was compounded by palls of smoke from the cannon and musket fire, throwing Greene's column into disarray and confusion. One of Greene's brigades, under Brigadier General Adam Stephen, veered off-course and began following Meetinghouse Road, instead of rendezvousing at Market Square with the rest of Greene's troops. The wayward brigade collided with Wayne's brigade, and mistook them for redcoats. The two American brigades opened fire on each other in the fog, causing both to flee. The withdrawal of Wayne's New Jersey Brigade, having suffered heavy losses attacking Cliveden, left Conway's right flank exposed.