Final answer:
The question appears to involve a fictional scenario possibly related to the First World War, and does not directly match historical figures from the Devonshire Regiment or those listed (pertaining to the American Revolutionary War). Without the correct context, a definitive answer cannot be provided.
Step-by-step explanation:
The question seems to be referencing a scenario that may relate to the First World War, based on the mention of a regiment and lieutenants. However, the Devonshire Regiment and the specific situations involving a dawn attack, as well as the names provided - Lieutenant Blake, Lieutenant Joseph, Lieutenant Schofield, and Lieutenant Leslie - do not directly correspond with historical figures related to the Devonshire Regiment.
The reference list provided (General George Washington, Brigadier General Daniel Morgan, Major Benedict Arnold, Major General Benjamin Lincoln) includes notable figures from the American Revolutionary War, a different conflict entirely. Therefore, these individuals wouldn't be the answer to the question as it pertains to a different historical era and context.
It's possible that the question may be referring to a fictional scenario from a movie, book, or other forms of storytelling, such as the film '1917' where similar names and circumstances appear. Without the correct historical context, it is not possible to definitively answer the question about who specifically may die if the Devonshire Regiment attacks at dawn.