Grant again uprooted his army, and the II Corps now crossed the James River and advanced on Petersburg. On June 16 the 1st Division joined in an attack on the Confederate entrenchments outside the city, but this would prove to be the beginning of a long siege that would last until April 2, 1865. During this period, the 140th was involved in various movements and smaller battles which comprised the overall siege, including Ream's Station on August 25, and Hatcher's Run February 5–7, 1865.