Do you suppose he really said “nuts”? I can think of a less printable synonym that seems more likely
From Wiki - certainly “NUTS” was in the official reply to the Germans. But contemporaneous accounts seem to say that yes he did say that and no he did not tend to use a lot of profanity. But I think what is indisputable is that that’s what went into the official reply.
On December 22, 1944, through a party consisting of a major, a lieutenant, and two enlisted men under a flag of truce that entered the American lines southeast of Bastogne (occupied by Company F, 2nd Battalion, 327th Glider Infantry), General von Lüttwitz sent the following ultimatum to Gen. McAuliffe:
To the U.S.A. Commander of the encircled town of Bastogne.
The fortune of war is changing. This time the U.S.A. forces in and near Bastogne have been encircled by strong German armored units. More German armored units have crossed the river Our near Ortheuville, have taken Marche and reached St. Hubert by passing through Hompre-Sibret-Tillet. Libramont is in German hands.
There is only one possibility to save the encircled U.S.A. troops from total annihilation: that is the honorable surrender of the encircled town. In order to think it over a term of two hours will be granted beginning with the presentation of this note.
If this proposal should be rejected one German Artillery Corps and six heavy A. A. Battalions are ready to annihilate the U.S.A. troops in and near Bastogne. The order for firing will be given immediately after this two hours term.
All the serious civilian losses caused by this artillery fire would not correspond with the well-known American humanity.
The German Commander.
According to various accounts from those present, when McAuliffe was told of the German demand for surrender he said “nuts”. At a loss for an official reply, Lt. Col. Harry Kinnard suggested that his first remark summed up the situation well, which was agreed to by the others. The official reply was typed and delivered by Colonel Joseph Harper, commanding the 327th Glider Infantry, to the German delegation. It was as follows:
To the German Commander.
NUTS!
The American Commander
Suffice it to say, the Germans were perplexed at the short reply. Harper offered an explanation of the meaning of the word to the Germans, telling them that in “plain English” it meant “Go to hell.”[3] The word choice came directly from McAuliffe and was typical for him. Vincent Vicari, his personal aide at the time, recalled that “General Mac was the only general I ever knew who did not use profane language. ‘Nuts’ was part of his normal vocabulary.”[4]
The threat of artillery fire did not materialize, although several infantry and tank assaults were directed at the positions of the 327th Glider Infantry. In addition, the German Luftwaffe entered the attacks on the town, bombing it nightly. The 101st was able to hold off the Germans until the 4th Armored Division arrived on December 26 to provide reinforcement.