The Williams family arrived in New York on 23 June 1864 via the ship The General McClellan. The British Mission record (as documented in Mormon Migration) indicates that Thomas was a Collier, traveling with his wife Ann Jones, and children David, Lewis, and Ann.
This Thomas and Ann Williams should not be confused with another Thomas and Ann Williams, also of Wales, who traveled on the same ship and overland companies. Both Thomas Williams have records in PEF ledger C, page 748. The record for this Thomas Williams has a balance of $245.60. (Bond number 4374.)