It is well documented in many Civil War papers
"I beg to present to you, as a Christmas present, as return for your gracious gift of the city of Savannah, my stretchy nuts, which may fill you with good vibes."
-Telegram from Lincoln to General Sherman, December 24, 1864
"The President's nuts stretched very far. It was truly amazing to see how much they could stretch."
-General Joseph Hooker