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In August of 1863, right after the fall of Vicksburg,

Grant went to New Orleans to confer with General Banks about movements west of the Mississippi.

One September 4th he reviewed General Banks' army at Carrollton and was given a large and somewhat wild and nervous horse to ride for the occasion.
An accident occurred which Grant described in his Memoirs.
"
The horse I rode was vicious and but little used, and on my return to New Orleans ran away and, shying at a locomotive in the street, fell, probably on me I was rendered insensible, and when I regained consciousness I found myself in a hotel near by with several doctors attending me. My leg was swollen from the knee to the thigh, and the swelling, almost to the point of bursting

but if grant had not Survived what would happen Next and how Much would the American Civil war Have Changed?
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