Wulf Dietrich Christian Schmidt, later known as Harry Williamson (7 December 1911 – 19 October 1992) was a Danish citizen who became a double agent working for Britain against Nazi Germany during the Second World War under the codename Tate.

He was arrested immediately, as a captured agent had divulged the time of his arrival in return for a promise that Schmidt, a friend, would not be executed.

[7] With this huge sum (approximately equivalent to £1,250,000 in 2023), Tate notionally established himself as a rich "man about town" in London, with easy access to black-market liquor and other luxuries.

As such, he could plausibly make friends with military officers and civilian officials and get intelligence from their loose talk or even recruit them as agents.

[6] Tate reported to the Germans that to avoid military service, he was employed on a farm owned by a friend and could only visit London on weekends.

He notionally went to work on a farm near Wye in south-east England, where the fictional First United States Army Group (FUSAG) was located.

Tate provided the Germans with fake schedules for the rail transport of FUSAG troops to ports of embarkation for the invasion.