When the War Between the States began - the citizens of the CSA saw it strictly as a defensive war. However, many soldiers were resentful when Gen Lee led an invasion of the North (Antietam - Sep 1862). His purpose was to to damage Northern morale in anticipation of the November (crogessional) elections. Although a tactical draw, the Battle of Antietam was a strategic victory for the Union. It forced the end of Lee's strategic invasion of the North and gave Abraham Lincoln the victory he was awaiting before announcing the Emancipation Proclamation.on September 22. So If Lee had not crossed the Mason-Dixon line, would that have made a difference in the WBTS?