RMS Lancastria (later HMT Lancastria) was a British Cunard[2] liner commandeered by the UK Government for war, sunk on 17 June 1940 during World War II with the loss of over 4,000 lives, possibly many more.[3] It is the greatest ever loss of life in the sinking of a single British ship, claiming more lives than the combined losses of the RMS Titanic and RMS Lusitania. It had also the highest death toll for UK forces in a single engagement in the whole of World War II.