Ever heard this? I see them all the tie on the web and recently they were posted to my blog. These are a couple combined.

The South went to war on account of Slavery. South Carolina went to war – as she said in her Secession proclamation – because slavery wd. not be secure under Lincoln. South Carolina ought to know what was the cause for her seceding. . . . I am not ashamed of having fought on the side of slavery – a soldier fights for his country – right or wrong – he is not responsible for the political merits of the cause he fights in. The South was my country.

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(Quotes in bold)

The truth is these are cherry-picked quotations from a 1907 Mosby letter. Here is the entire letter and how each quote falls in place in the letter.

John S. Mosby to Samuel Chapman
Washington, D.C., June 4, 1907.
Autograph letter signed, 2 pages + envelope.
June 4th 1907.

Dear Sam:

I suppose you are now back in Staunton. I wrote you about my disgust at reading the Reunion speeches: It has since been increased by reading Christians report. I am certainly glad I wasn’t there. According to Christian the Virginia people were the abolitionists & the Northern people were pro-slavery. He says slavery was “a patriarchal” institution – So were polygamy & circumcision. Ask Hugh if he has been circumcised. Christian quotes what the Old Virginians – said against slavery. True; but why didn’t he quote what the modern Virginians said [struck: about] [inserted: in] favor of it – Mason, Hunter, Wise &c. Why didn’t [struck: t] he state that a Virginia Senator (Mason) was the author of the Fugitive Slave law – & why didn’t he quote The Virginia Code (1860) [strikeout] that made it a crime to speak against slavery, or to teach a negro to read the Lord’s prayer. Now while I think as badly of slavery as Horace Greeley did I am not ashamed that my family were slaveholders. It was our inheritance – Neither am I ashamed that my ancestors were pirates & cattle thieves. People must be judged by the standard of their own age. If it was right to own slaves as property it was right to fight for it. The South went to war on account of slavery. South Carolina went to war – as she said in her [2] Secession proclamation – because slavery wd. not be secure under Lincoln. South Carolina ought to know what was the cause for her seceding. The truth is the modern Virginians departed from the teachings of the Father’s. John C. Calhoun's last speech had a bitter attack on Mr Jefferson for his amendment to the Ordinance of `87 prohibiting slavery in the Northwest Territory. [struck: Jo.] Calhoun was in a dying condition – was too weak to read it – So James M. Mason, a Virginia Senator, read it in the Senate about two weeks before Calhoun's death – Mch. 1850. Mason & Hunter not only voted against The admission of California (1850) as a free state but offered a protest against [inserted: it] wh. the Senate refused to record on its Journal Nor in the Convention wh. Gen. Taylor had called to from a Constitution for California, there were 52 Northern & 50 Southern men

against slavery -- men–but it was unanimous against slavery --But theVirginia Senator, with Ron Tucker& Co. were opposed to giving[inserted: local]self-government to California. Ask Sam Yost to give Christian a skinning. I am not strikeout ashamed of having fought on the side of slavery–a soldier fights for his country–right or wrong–he is not responsible for the political merits of the course he fights in. Yours Truly The South was my country.

Jno: S. Mosby

[written across the top of page 1]In Feby. 1860 Jeff Davis offered [inserted: a]bill in the Senate wh.passed, making all theterritoriesslave territory.(see Davis’ book. )He was opposed to letting the people decide whether or not they w[struck: ould] [inserted: dhave]slavery–Wm. A. Smith, President of Randolph Macon quit his duties as a teacher & in 1857-8-9-60 traveled all over Virginia preaching slavery& proving it was right by the bible.

[envelope]
Captain Sam Chapman Staunton Virginia
[verso]Senator Jas. M. Mason was the author of the Fugitive Slave Law of 1850;but the Ordinance 1787 for the government of the Northwestern Territory, contained in its amended form, as passed, the fugitive slave provision.

See Benton's Thirty Years, p 133.
Notes: Written on Department of Justice stationery.
Christian is George Christian

This website qives more info on the letter

http://www.gilderlehrman.org/history-by-era/reconstruction/resources/former-confederate-officer-slavery-and-civil-war-1907

A former Confederate officer on slavery and the Civil War, 1907
A primary source by John S. Mosby

Letter from John S. Mosby to Sam Chapman, June 4, 1907. (Gilder Lehrman Collection)
How can a soldier be proud of the country he defends while at the same time opposed to the cause he is fighting for? John S. Mosby, the renowned Confederate partisan leader, dealt with this moral dilemma years after the Civil War ended. Mosby despised slavery and believed the South had seceded to protect it. Yet he fought to defend the Confederacy, as he felt his patriotic duty to his nation outweighed all other factors. After the war, Mosby befriended General Ulysses S. Grant and joined the Republican Party, but firmly stated, “I am not ashamed of having fought on the side of slavery – a soldier fights for his country – right or wrong – he is not responsible for the political merits of the course he fights in . . . The South was my country.”

In the wake of Reconstruction a growing number of southerners began to argue that protecting slavery had not been the real cause of the war, and some even claimed that slavery was in fact a just institution. These ideas spread and grew into the “Lost Cause” movement, a romantic vision of the South that would eventually gain exposure from the popularity of films including Birth of a Nation and Gone with the Wind. In this letter written in 1907, when he was an attorney at the Justice Department, Mosby furiously attacked the men who supported this mindset. Mosby expressed a complex and fascinating set of beliefs about the Civil War at a time when its history was just beginning to be written.
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Any Disagreement???