Rev Thomas Reardon was pastor of Saint Bernard's from August 1847 until 1883 when he retired to Ireland due to "ill-health". There are several references in the records to health problems and one of those appears to coincide with a possible trip to Charleston at the end of the Civil War.
Who was your family in Easton at the time? I'm putting together information for an eventual expanded history of Saint Bernard's Church. I've attached an article about an incident in the life of Father Reardon.