Dominique Urbain has fallen ... victim of an April Fool's joke.
Let me start from the beginning. March 30, 1917. Verdun. End of mission. Bad landing. A hit on the noggin, lost consciousness. Dominique wakes up in hospital with his head bandaged - sentenced to stay in this hospital bed for 20 days. 1 April comes and with it rounds by the main surgeon, who looked at his chart and mentioned "mal a la tete" and then he ordered Dominique to get out of bed and return to duty. Apparently Dominique's wingman wrote the additional zero on his chart for a good chuckle. One day Dominique will return the favor. One day.
"Take the cylinder out of my kidneys, The connecting rod out of my brain, my brain, From out of my arse take the camshaft, And assemble the engine again."