What is the climax of Soldiers Heart by Gary Paulsen?

The climax of "Soldier's Heart" by Gary Paulsen is when Charley is unable to adjust to civilian life after returning from the Civil War, his mental health deteriorates rapidly, leading to violent outbursts and erratic behavior. This culminates in a tragic incident where Charley goes on a rampage, resulting in the death of his former friend and ultimately his own suicide.