Statistics for occurrence #1 of “Mr. Mason” in chapter 4.16 of Robert Underwood Johnson, Clarence Clough Buell, Battles and Leaders of the Civil War: Volume 2.:

...'s clerk, at Captain Wilkes's order, had already purchased from the steward of the Trent to add to the comfort of the new guests. When all was ready and the boats were in waiting, I notified both Mr. Mason and Mr. Slidell that the time had come to send them to the San Jacinto. They came quietly down to the main-deck, and there repeated that they would not go unless force was used — whereupon tw...
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