Completed the following sentence: At the outbreak of the Civil War in 1861, von Vegesack left for the United States and joined the Union Army. <unk> <unk> <unk> ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ <unk> <unk> As an aide-de-camp (ADC) to Joseph K. Mansfield he took part in the artillery bombardment of Newport News. 1862 he resigned, but then he joined Major General George B. McClellan in his siege of Yorktown. As an ADC to Butterfield he took part in the battles of Hanover Court House, of Seven Pines and of Fair Oaks.<unk> As an ADC to Butterfield he took part in the battles of Hanover Court House, of Seven Pines and of Fair Oaks. ąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąą
Station, and Malvern Hill. Vegesack was appointed colonel of the 20th New York Infantry, the German "Turner" regiment.<unk> Vegesack was appointed colonel of the 20th New York Infantry, the German "Turner" regiment. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ He took part in the Second Battle of Bull Run.<unk> He took part in the Second Battle of Bull Run. <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> Vegesack was in the Battle of Fredericksburg. In May 1863 Vegesack's regiment was a part of Joseph Hooker's left wing in the Battle of Chancellorsville.