William Hopper who was a Hospital Steward in the 90th New York Veteran Volunteers Regiment. The letter is dated Key West Fla. Sept 5th 1862. The letter reads:
My Dear Wife,
On the 1st of this month I had a slight attack of yellow fever which might have proved fatal had I not taken it in time as it is life or death very quick but by good treatment and attention I have recovered the treatment was a hot mustard bath after taken the bath I was wraped up in woolen blankets and allowed to sweat in the mean time I took a large dose of castor oil....if I had not known the symptoms I should have no doubt let it run on me until it would be too late. I am all right now unless I get another attack. I will return to duty in 3 or 4 days. I get good care here. Please let me know how much you owe Mother up to the 1st of September. Our pay is due again but I don't suppose the pay Master will come here until the fever has disappeared from the Island write soon. I got a letter from Ben saying Edward Andariese has gone to the War he says Astoria is all clearing out to the War. Your affectionate Husband Wm H Hopper.
This Civil War letter is for sale on Ebay Item number: 310107115968.