Hallo Brian

On 12.10.1944 the british escort carrier HMS Emperor (D-98), HMS Hunter (D-80) and HMS Stalker (D-91) sunk the german Anna (ex. italian Adriana) 4352 BRT in the harbour of Volos.

May the attack was in the night 12. / 13.10.1944

This is the only Anna sunk, i can find that would match your date.

I have 91 ships with the name Anna in my database (some of them are german river ships), so i think your dutch website mixed up some dates and names

best regards
Axel