Born at the beginning of World War I, Wilhelm was patriotically named after Germany's emperor, Wilhelm II. The eldest son, Wilhelm was raised a Lutheran, but after the war his parents became Jehovah's Witnesses and raised their children according to their faith. After 1931, their home in the rustic town of Bad Lippspringe became known as a center of Jehovah's Witness activity.
1933-39: The Kusserows were under close scrutiny by the Nazi police because Witnesses believed that their highest loyalty was to God, not to Hitler. The Kusserows' home was repeatedly searched and some of their religious literature was confiscated. They offered refuge to fellow Witnesses and continued to host Bible study meetings in their home, illegally, even after Wilhelm's father had been arrested twice.
1940: Germany had been at war since September 1939 and Wilhelm had been arrested for refusing induction into the German army, adhering strictly to the commandment, "Thou shalt not kill." For Wilhelm, God's law came before Hitler's laws. The judge and prosecutor tried to change his mind. They offered to rescind his execution order if he renounced his "evil and destructive" beliefs. Wilhelm refused. The court sentenced him to death.
According to his defense counsel, Wilhelm "died in accordance with his convictions." He was shot by a firing squad in Muenster Prison, on April 27, 1940.