Generals Robert E. Lee, Stonewall Jackson, James Longstreet, and others were West Point graduates with Mexican–War experience. Their tactical skill prolonged the war.
Fighting on home ground—forests, mountains, rivers—favored defenders. Southern irregular warfare tradition (e.g., Quantrill's Raiders, Mosby's Rangers) disrupted Union supply lines.
Civilian networks provided food, horses, intelligence, and recruits. Interior lines shortened Confederate supply routes compared to Union's long, vulnerable lines.
Initial Confederate control of the lower Mississippi blocked Northern trade and troop movement. Lost after Vicksburg/Port Hudson fell (July 1863).
Aggressive "Cotton Diplomacy" sought British/French recognition and intervention. Near-success after Second Manassas (1862) and Chancellorsville (1863), but Emancipation Proclamation and Union victories thwarted it.