In 1943, Lahousen was sent to the Eastern Front and thus escaped the final days of the Abwehr, which, along with Canaris, had fallen into disfavour.[1] Lahousen later claimed that he was the one who supplied the bomb used on the Smolensk plot (Operation Spark, 13 March 1943). The assassination attempt carried out by Fabian von Schlabrendorff failed.