Jan Visser, pseudonym Grey Jan was a road and hydraulic engineering contractor from Sliedrecht.
He was the one who, together with Koos Meijer, established the Sliedrecht - Lage Zwaluwe route. This connecting line served to transmit messages for the Dutch Bureau of Intelligence. It also carried hundreds of people including Allied pilots or soldiers left behind after the Battle of Arnhem. On the way back, they brought food and medicines (especially Insulin) that were urgently needed. As a line-crosser himself, he undertook this route 37 times.
On the night of 4-2-1945, together with Koos Meijer, General John Hackett and Divisional Doctor Greame Warrack, who had been brought to Sliedrecht by the resistance after the failed Operation Market Garden, he canoed to Lage Zwaluwe.
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