128584
It was active in the Seven Days ' battles ; then went into camp at Harrison 's landing ; arrived at Manassas too late to participate in that battle ; took a prominent part in the battle of Antietam , where Gen. Richardson was killed and Gen. Hancock succeeded to the command of the division .
 Richardson, Hancock
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Richardson, Hancock