The documents, uncovered in the Churchill Archives in Cambridge and the National Archives, show that Knopf and his sub-agents alerted British Intelligence to German plans for an invasion of Malta in 1942, relayed Rommel’s intentions in North Africa and revealed Hitler’s fatal obsession with capturing Stalingrad on the Eastern Front.
The Führer was “determined to capture Stalingrad at all costs”, Knopf reported. Hitler’s disastrous assault on the Russian city, which led to the destruction of the German 6th Army, is seen as a turning point in the war.
via Uncovered documents reveal spy who fed information on Hitler’s secrets – Times Online.