They remained engaged in the siege for the rest of the year and into early 1865. On July 30, a Union sapper mine detonated explosives underneath the Confederate trench, resulting in a day of fighting in what's called the Battle of the Crater. On August 18, 1864, they were part of the successful Union raid, known as the Battle of Globe Tavern, to cut the Weldon Railroad and reduce the supply lines for the Petersburg defenders. In October, there was another attempt, known as the Battle of Boydton Plank Road, to sever another Confederate supply line, but the attack was withdrawn.