Final answer:
The provided information does not mention a person named Farnsworth or the retreat of enemy troops connected to him. Instead, various historical retreats are illustrated, such as Lee's retreat from Gettysburg and the Dunkirk evacuation during World War II, among others. Without more context or reference, it is not possible to accurately answer the student's question regarding Farnsworth's retreat.
Step-by-step explanation:
The essence of the student's question seems to be regarding a specific incident or battle where someone named Farnsworth led troops and subsequently ordered a retreat. However, none of the provided textual references directly mention a person named Farnsworth or a scenario where he retreats enemy troops. The closest relevant incidents discussed in the given contexts are significant historical retreats during various battles.
For instance, General Robert E. Lee's retreat after the end of the Gettysburg battle is mentioned, marking a pivotal moment in the American Civil War. The text also describes the successful but desperate retreat of Allied soldiers from Dunkirk during World War II. Another example is General McClellan's retreat to Harrison's Landing during the Seven Days Battles. And lastly, it encompasses Washington's stealthy and strategic retreat from Howe's forces during the American Revolutionary War.
To address the question directly, it would be necessary to have a specific historical context or reference to the event involving someone named Farnsworth. As it stands, the provided information does not correlate with the details in the student's question.