  Wycech's service for Poland isn't in question. But Ders des Ders has him as a Russian vet aswell. That's what we're doubting, because the article doesn't mention it. But when he dies we will hear about it quickly. He's quite revered in Poland as their last vet. Kowalski is certainly unverified because of this, but could still have served for another country. And his death should be noted too, being the oldest man in Poland.   