I'm talking exclusively about this particular breach. 48000 out of 50000 have returned voluntarily. I don't think that counts as trying, so talking about success is a category error. This was a (deadly) flash mob.
I assumed their qualifier was being applied to this case as well. However I don't think there's any ambiguity about who are we talking about in this specific thread of comments.
Actually OP was talking about migrants crossing from Belarus.