 The column entered Loudoun in the Between the Hills valley and marched through Hillsboro and Woodgrove, reaching Purcellville on the morning of the 21st.The column was under near continuous sniping fire from Confederate partisans during the march, 5 of which were captured at Hillsboro.The Federal incursion did not go unnoticed by John Mosby's scouts and accordingly he ordered a rendezvous of his Rangers the following morning.