Operations Military_operation Taxable , Glimmer and Big Drum were tactical military deceptions conducted Action on 6 June 1944 in support Supporting of the Allied landings Self_motion in Normandy .

Glimmer and Taxable played on the German belief Coming_to_believe , amplified Cause_change_of_position_on_a_scale by Allied Cause_to_amalgamate deception efforts over the preceding months , that the main invasion force would land Arriving in the Calais region .