May 9, 1940 – KTB 4. Pz. Div.

Around 13:35 hrs., the message is carried down the line and received by 4. Panzer Division (4. Pz. Div), delivered via IV. AK. The code word is “Hindenburg 100535” – it translates into “Border crossing at 05:35 hrs. on May 10, 1940”. The movements of the individual units are initiated immediately.

At 22:00 hrs., 4. Pz. Div. is moving into their Divisional Command Post at Richterich, north of Aachen.

Source: KTB 4. Pz. Div (BArch. RH-20-4/6)