4:30 p.m.  The Union defense had fallen back on the Thomas Farm but had managed to stall the Confederate attack when Terry detached half of his brigade, swept down by the river, then hit the weakened and exposed Union right flank (1). Wallace ordered his force, low on ammunition, to retreat. The order reached the right flank just as it began to crumble. The Union troops retreated in the direction of Gambrill Mill and made their way back to Baltimore (2). Their defense succeeded in delaying Early’s army for a full day, forcing the Confederates to camp on the battlefield until the following morning.