In the lead up to the Battle of Normandy and the D-Day landings Johnson continued to score regularly. His 22—23rd victories were achieved on 25 April 1944 and Johnson became the highest scoring ace still on operations. These victories were followed by another Fw 190 on the 5 May (no. 24); III./JG 26 lost "Feldwebel" Horst Schwentick and "Unteroffizier" Manfred Talkenberg killed during the air battle. After the landings in France on 6 June 1944, Johnson added further to his tally, claiming another five aerial victories that month including two Bf 109s on 28 June. The mission in which Johnson recorded his 26th victory on 22 June was particularly eventful; four more Fw 190s fell to his wing. After bouncing a formation of Bf 109s and Fw 190s, he shot down a Bf 109 for his 29th victory. Five days later, Johnson destroyed two Fw 190s to reach his 30—31st air victories.