During the Belkan War, he proposed revising the Belkans' troop transportation methods and their fighting tactics at Area B7R. It is unclear if these revisions were implemented. Engel was later shot down over Route 171 in Sapin by the Galm Team.
Following the war's conclusion, Engel worked with the Belkan Air Force in reducing damage that airframes would incur during operations.
- Engel's callsign, "Harpune", is German for "harpoon".