[CharlesM]

Churchill units often had a troop of 4 M10 76mm or Achilles 17-pdr SPs attached for this purpose. There was a drive to fit as many 75mm guns before D-Day to Churchill Mk IVs (only one Mk III went to Normandy), turning them into Mk VIs. This was done by issuing conversion kits fitted in the field. Once the AP deficiency came to light some 6-pdr Mk IVs were retained, though by D-Day some units were completely equipped with 75mms - 6th Guards Tank Brigade being one.