In October, the unit was then relocated, at first to Bönninghardt and on 16 December to Jever, to protect the northern seaboard and the "Kriegsmarine" naval bases. During the Battle of the Heligoland Bight on 18 December 1939, he was credited with the destruction of a Royal Air Force (RAF) Vickers Wellington twin-engine bomber on a mission to Wilhelmshaven. A Freya radar on Wangerooge, under the command of "Leutnant" Hermann Diehl, had detected the approaching bombers. Falck had claimed two Wellington bombers shot down southwest of Heligoland, but only one was confirmed. Falck's aircraft was severely damaged, resulting in a forced landing. On 10 January 1940, Falck claimed a Bristol Blenheim bomber from No. 110 Squadron shot down, followed by another No. 110 Squadron Blenheim bomber on 17 February. Blenheim "P4859" shot down on 10 January, was on a mission searching for shipping over the North Sea. The crew, pilot Sergeant Henry Hanne, observer Sergeant George Llewelyn William, and Aircraftman 1st Class (AC1) Edwin Vick were killed in action. On 17 February, Blenheim "N6211" was also on a search for shipping mission before it was intercepted by Falck. The crew, Sergeant Frederick John Raymond Bigg, Sergeant William Barnard Woods, and AC1 Jack Orchard, were reported as missing in action.