sentences:  Examples include the murder of Ukrainians in Lviv by the NKVD in 1941, the murder of Polish prisoners of war at Katyn in 1940, executions of German prisoners of war by French irregulars in 1944, and the sinking of the German hospital ship "Tübingen" by the RAF in 1944.De Zayas was the first researcher to evaluate the extant 226 volumes; about half of the total records, the rest apparently having been burned in Langensalza, Germany, near the end of the war (de Zayas; pp.xiii-xiv).