@Joe Nation,
In 1942/43, my father was as a medical staff segeant and in Russia for the second. (He had been both in the suburbs of St. Petrsburg/Leningrad and Moscow.)
On the retreat, he often became the commanding officer of some towns/villages as well as the only "doctor" in a military hospital .... because no other officers were there.
He was a 'doctor' in a field hospita, which was situated in a very famous abbey/monastery [I can't remember that name now], head of the ward with the most heavily wounded (he was attached to a tank division).
His (military) sergeant noticed by pure chance that the Russian troops were already in most parts of the building.
So my father with the three soldiers left from his company and about a dozen wounded fled on/in his "armored medical evacuation vehicle" to the next main casualty location.
The were followed by Cossack on horses. His sergeant, a young Westphalian farmer, said his heart would bleed but since those boys were their job like they did theirs .... so he shot with his machine gun all what was left on ammunition ... on the horses.
When they arrived at main casualty location, that place was fleeing as well. The military police was trying to stop it (or whatever). And a police general wanted to arrest my father since he didn't have those 2,000 blankets but only wounded soldiers.
And then his sergeant came forward, in a torn uniform, covered with hoses' and humans' blood, pointed with his now unloaded machine gun towards this military police general and said: "What did you ask the doctor, general, exactly, sir?"
And then they moved on.
(My father never - as far as I've read - mentioned specific places/names in his letters. He didn't write about this either [but told me about it]. He mentioned in a letter to my mother, however, that he was safe but could get some difficulties with the military police [which never happened].)
Medical students in Germany of those days studied half a year at a university - the other time they served as soldiers.
My father was at first a wireless operator, stationed in France.
At that time, he twice "nearly crossed the English channel" - there has been one photo, where you could imagine that the wide spots were the White Cliffs of Dover. But though I re-found a couple of photos from France, two are missing ...
Studying was "an adventure", too. The last years, father studied in Münster again. Since that city was heavily bombed a couple of times, his faculty later was situated in a smaller rural spa town, with just some handful of students left.