"Ultimatum" also unsuccessfully attacked the Italian merchants "Ravello", "Luciano Manara" and "Unione", the Italian submarine "Zaffiro" and the German auxiliary patrol vessel Uj 6073 / "Nimeth Allah".She had more luck on 2 May 1944, when she shelled the harbour of Kalamata, Greece, sinking two sailing vessels, destroying five on the slips and damaging another.