 Complete the following phrase:  Towards the end of October, the entire slave-labour workforce of KL LublinMajdanek including Jewish prisoners of the Trawniki concentration camp were ordered to begin the construction of trenches that would become mass graves. Although the trenches were supposedly for defense against air raids, and their zigzag shape granted some plausibility to this lie, the prisoners guessed their true purpose.:232:403404:285286 The massacres, later assumed to have been revenge for German 