What was the mistake the confederate army made?

One significant mistake the Confederate Army made was underestimating the logistical challenges and the Union's industrial capacity. This was evident during key battles, such as Gettysburg, where they overextended their lines and failed to secure crucial terrain. Additionally, the Confederate leadership often struggled with coordination and communication, leading to missed opportunities and strategic blunders. These factors ultimately contributed to their inability to sustain a prolonged war against the Union's resources and manpower.