As a bit of background and context, Victoria 2 is a Grand Strategy Game set in the long 19th century, published by Paradox Interactive. Military conflict is a major part of the game, and every army and navy ideally will have a leader assigned to it. These leaders give bonuses to a military unit's performance - better attacking, better defending, higher morale, higher organization, faster speed, etc.

These leaders are normally randomly generated. However, when starting a new game the game designers pre-create some historical leaders who existed at the time. One of these dates is 1861 - the beginning of the American Civil War. Both the Union and Confederates get pre-generated leaders, and one of the Confederate leaders is Thomas "Stonewall" Jackson

In Victoria 2, Stonewall Jackson is one of the best leaders you can get, with his trait being a 5 bonus to defense. This is a massive advantage, and if on the defensive, especially behind a river or in mountains, an army commanded by Jackson is extremely difficult to defeat thanks to this huge bonus. Presumably, Jackson was given this massive defensive bonus thanks to his nickname - "Stonewall"

Except, this is bad history. While Jackson is generally considered to be a highly skilled military commander, deserving of strong bonuses in a video game, his skills lay in precisely the opposite arena of how he is portrayed. Jackson was an enormously aggressive general, and he built his military career on conducting long, hard marches and furious attacks against Union positions.

At 1st Bull Run, where Jackson earned his nickname, the battle was eventually won when Jackson's soldiers conducted a series of counterattacks against Union positions, driving them from a key hill and from the battlefield. Jackson's most brilliant campaign, the Shenandoah Valley Campaign, involved Jackson's army conducting long marches and launching furious attacks to defeat three separate Union armies in detail. Jackson's final battle, and often considered his greatest triumph before being killed there, was the Battle of Chancellorsville. Jackson led a surprise attack against the flank of a much larger Union force that eventually forced the Union troops to retreat