Final answer:
This question pertains to historical perspectives surrounding General Lee's respect in Europe and the surrender of the Confederate Army in the American Civil War. Lee's respect may be attributed to his strategic leadership and the Confederacy's aspirations for European support. The surrender at Appomattox Courthouse signified the Union's strength and the end of the Confederate resistance.
Step-by-step explanation:
The question encompasses a historical analysis regarding the perspectives and locations of particular individuals during historical events. Longstreet's opinion on Stuart's whereabouts is not directly addressed in the given information, hence we cannot confidently provide an answer regarding that part of the question.
However, when referring to General Robert E. Lee's respect in Europe as outlined by Fremantle, it was potentially due to Europe's recognition of Lee's military leadership and the hope of the Confederacy for support from Great Britain and France during the American Civil War.
Respect for Lee could also stem from traditional European military values such as bravery, strategic acumen, and perseverance, leading Europe to view Lee's conduct within the same framework as their own military leaders.
As for General Ulysses S. Grant's correspondence with Lee, it indicates the Union's position of strength and Lee's eventual recognition that further resistance by the Confederacy would be futile, leading to the surrender of the Army of Northern Virginia and reflecting the integrity and the valor with which he led his troops throughout the arduous conflict.