>>what difference it makes specifying which concentration camp they liberate?
While it may not be absolutely necessary for the logline, if it actually happened, your going to have to name a camp in the script. So I'm curious.
If a group of boy scouts actually tried to liberate a concentrate camp, that's the material for a compelling story. Dare I say a high concept story, one that sells itself with little need for elaboration or explanation. So:
Based on true events, in the final days of World War 2, a young Jew rallies a Polish boy scout troop to liberate a concentration camp.
or perhaps...
Based on true events, in the final days of World War 2, a young Jew rallies a Polish boy scout troop to liberate the concentration camp to which his family has been sent.
I suggest prefixing the logline with "based on true events" to signal you're not just making it up whole cloth. Once again, as with so many other Holocaust stories, truth is stranger than fiction.
Although, of course, as with many other Holocaust films, creative liberties may be taken. But not too many: if the scouts weren't rallied and led by a Jew from the ghetto, I wouldn't gild the lily. It's good enough of a story that some young Poles had the courage and conviction to do the right thing. (In contrast to the many Poles -- not all, but too many -- who did nothing or aided and abetted the persecution of the Jews).
fwiw.