Final answer:
The truthfulness of the statement about Duncan standing against the National Theatre alone cannot be confirmed without context. If it relates to Shakespeare's character in Macbeth, the statement is likely false.
Step-by-step explanation:
It seems like the statement 'Duncan stood against the National Theatre alone' is related to a specific context or narrative, possibly from a piece of literature or a historical account. Without additional context, it's not possible to determine the veracity of the statement as true or false. However, if this is a reference to a character in a play, novel, or historical figure, you would need to refer to the source material to confirm the accuracy of the statement.
If the reference is to the character in Shakespeare's play Macbeth, for example, the statement might not be factually correct, as Duncan is a character who was supported by his nobles and doesn't have any direct relation to the National Theatre. Therefore, in a literary context, the statement could be false. Yet, if this question is related to a different narrative or historical event, the answer might vary.