“…no coincidence that Missouri saw the greatest bloodshed in that war.”

Missouri was a keystone in the Union cause. She was also a “border state” during the war. The nation’s major western lines of communication and travel were anchored in the state the Pony Express and the California, Oregon and Santa Fe Trails. The three major waterways of the country, the Missouri, Mississippi, and Ohio rivers, either passed through or touched the state. According to the 1860 census, Missouri ranked eighth in population, making it an excellent manpower resource for the army. The state was rich in deposits of raw materials — lead for bullets, iron for cannonballs. Its agricultural production could feed an army.

We talk nowadays regarding elections about “battleground states”, Missouri was extremely sought after by both sides of the conflict, so of course there were many skirmishes within her borders, (3rd highest behind Virginia and Tennessee) even though only 13,800 Union Troops lost their lives (9,200 to disease) in Missouri… I say “only” because the total number of Union troops killed during the war was 365,000

Secondly, if you care to actually read the entire letter, you will also read this statement “Behold He will not fail you! He will come with ten thousand of His
Saints, and all His adversaries shall be destroyed with the breath of His
lips! All those who keep their inheritances, notwithstanding they should
be beaten and driven, shall be likened unto the wise virgins who took oil
in their lamps.”
Joseph Smith never meant that the enemy would be destroyed instantly, or that the saints would not suffer. As part of his message to the saints he tells them they they will suffer and be driven before their enemies; but in the end they would again regain their inheritence, as long as they remained faithful. As he is comparing them to the wise virgins it seems obvious that this promise is to be fulfilled at the second coming.

Nothing false about anything here.