Kenner was part of a delegation of Congressmen and Senators that Lee had invited to examine the captured Rivington Men's headquarters in Richmond after the Richmond Massacre occurred on March 4, 1868. He had been primed by Judah Benjamin to ask the purpose of the meeting allowing Lee to explain what he had discovered about the Rivington Men.[2] As part of his explanation, Lee had laid out captured reference books and other documents for the delegation to examine. This strengthened Kenner's support for Lee's position.[3]