Everything you need to understand or teach In Solitary Witness by Gordon Zahn.
Franz Jagerstatter is an ordinary peasant farmer when the Nazis move into his home country of Austria. Jagerstatter is ordered to report for military training under the Nazi regime and does so but then refuses to serve in the military, citing a conviction that the Nazis are evil and that war is unjust. He is arrested and imprisoned for his stance. Despite being given opportunities to change his mind, he refuses, continues to stand for what he believes to be a necessary position in the eyes of God, and is sentenced to death. Though he knows he will be executed, he refuses repeated offers to forego the execution by serving in the military. He is even offered a non-combat position but refuses that as well, saying that any service for the Nazis will be tantamount to defying God and earn himself a place in eternal hell.
In Solitary Witness Lesson Plans contain 109 pages of teaching material, including: