ARMY LETTER The 3d Ohio Cavalry- Where it is and What it is Doing. In Front of Marietta, Georgia Camp 3d O.V.C., June 29, 1864. Ed. Democrat. Dear Sir: Knowing that some of the readers of your paper feel a deep interest in the welfare of the members of Co. H, I propose dropping a few lines in regard to them, and the regiment in general. Since the brigade left Columbia, Tennessee, on May 22nd there has been very few days of rest for us. Some of the time we were in a country where there was no forage, at other times where it was plenty, consequently our horse have suffered more than ourselves. After crossing the river at Decatur, we have been in four or five skirmishes, generally resulting in our favor. At Moulton, Alabama, the rebels tried to surprise us, but did not accomplish much, the fight resulted in a loss to them of 15 killed, 100 wounded, and 30 prisoners, including three commissioned officers. Our entire loss was 4 killed and 10 wounded, one taken prisoner. Company M, 3d, had one man killed; F, one slightly wounded. We joined the main army on the 8th inst., since that time we have been operating on the left, with varying success, but generally advancing. Our lines have advanced considerably since that time, and everything appears to be working well. Three of Company H were wounded on the 15th inst.-Sanford Moss, John Abnatha and Seth Hamblin. The latter had his left hand so badly shattered with a piece of shell, that amputation became necessary. Abnatha's wound is slight. I learned yesterday that Moss died of his wound, on the 22nd inst., in hospital near Big Shanty Station. This division of cavalry went out day before yesterday and made a demonstration. I have since learned that it was done in order to attract attention while the right and center advanced. It is reported that three lines of breastworks were carried and held. The health of the company is good. Yours, &c. John Spencer BRYAN WEEKLY DEMOCRAT July 14, 1864.