Jean
Yes, a Lazarett is a small military hospital. Civil and bigger military hosptals are called "Krankenhaus" - so the Bethesda Naval Hospital, also well known in Germany from NCIS and other TV series, is not a Lazarett.
And no, Siegburg is not on the map, and there are hundreds of camps and hospitals missing.As I have written somewhere above there were hundreds of inferior camps, work commandos to each main camp. The hospital on the Michaelsberg in Siegburg was such an inferior hospital for sure as there was only a small area in the abbey for the prisoners, the main area was reserved for german soldiers.
The prison camp picture is interesting, but I'm afraid better to allay than to inform the soldiers.
We got so much material and information, and with every answer two new questions...
Christoph