A good question, but in fact neither achieved neither happiness nor fulfillment in the army. Of course postwar Sherman served as Commanding General, but prior to the war both men had been discouraged by their experiences and had resigned from it. Jackson was unsurprisingly something of a prig and disapproved of his commanding officer's personal conduct, creating tension between the two which led to Jackson's resignation. Happily, he twice found true fulfillment as a husband while serving as a VMI professor and ultimately as father, though that was to be for a very short time. I don't think he was really happy nor fulfilled by his educational duties, being far more interested in spiritual matters at this time. His acceptance of Confederate command was likely due more to his severe devotion to what he considered to be his duty.Were generals like Jackson, Sherman successful because they found fulfillment/happiness in the army?
In that respect the two gentlemen you mentioned had little to worry about, particularly Scott who had served in responsible positions in the army as far back as the War of 1812 when he led an invasion of Canada, winning a notable victory over the British at Chippewa. Having commanded the successful defeat of the main Mexican army and captured Mexico City itself in a campaign which deserves to be far better known today, Scott was considered Presidential timber. I rather imagine the septuagenarian would have found life outside the U.S. Army unthinkable and impossible.The army was a dull life of boredom and hard work between the Mexican War and the Civil War. Even the duty of scouting had it's dangers and hardships. No wonder many had returned to civilian life and sought rank when the true call for patriotism sounded. If it had not been for the Civil War, the devotion of men such as General Scott, or Wool, would have maybe been insignificant, and most would resign, due to lack of promotional opportunity.
I prefer the boredom now. Suspense, anxiety, long hours, never knowing if tomorrow comes, knowing enemy is near, what song can I appreciate before it all gets too late.Just to update that thought, "The army was a dull life of boredom and hard work between WWI and WWII."