We learn, in part 2, that Peyton Farquhar is not only a "slave owner" but also an "original secessionist" who is "ardently devoted to the Southern cause" as well. He feels that
No service was too humble for him to perform in the aid of the South, no adventure too perilous for him to undertake if consistent with the character of a civilian who was at heart a soldier, and who in good faith and without too much qualification assented to at least a part of the frankly villainous dictum that all is fair in love and war.
In other words, Farquhar has high personal stakes in the war, because if the North triumphs over the South, he'll lose his slave workforce. Further, he loves the Old South and feels strongly in favor of retaining its way of life, so much so that he wants the South to leave the Union altogether and form its own country. He is a Southerner to the extreme. He is sort of the quintessential Old Southern man who would do practically anything in order to protect his life, the Southern life, as it has been. Farquhar would perform any small or significant service so long as it would further the Southern cause and war effort. He believes that all is fair in war, and he would absolutely be willing to risk his own personal safety if that means preserving everything else for which he cares. These beliefs allude to the lengths to which he is willing to go.