German Me 108 carrying Major Reinberger – a paratroop commander with secret documents on the planned Gelb Offensive in the West – makes forced landing at Mechelen in Belgium.
Reinberger makes bungled attempt to destroy documents and is captured by Belgian troops. German plans now compromised.
Atlantic: German blockade runner Bahia Blanca hits iceberg and sinks northwest of Iceland.
German destroyers lay mines off Newcastle and Cromer (night January 10-11).