The setting was Germany and Austria during some war, possibly WW2
The main person was a teen-ish german guy that joined the americans in the war, at some point he gets shot and passes out. When he wakes up he sees the german army stabbing all allies with bayonets, so he quickly changes into a german uniformthat he steals from a dead german, then he is taken back to a german camp and they find out he knows english so they use him as a translator/spy. At some point (possibly while he is recovering) he meets and falls in love with a nurse. They escape together into what i believe is Austria then they are going through an abandoned village and the allies shoot them with a machine gun. They both live (i believe)
I loved this book and would like to read it again, and google was no help to me. So could i get some help in finding the name and author?