In The Boy in The Striped Pajamas by John Boyne, what did Shmuel’s father do?

In The Boy in The Striped Pajamas by John Boyne, what did Shmuel’s father do?
In The Boy in The Striped Pajamas by John Boyne, what did Shmuel’s father do?
In The Boy in The Striped Pajamas by John Boyne, what did Shmuel’s father do?