From 20 to 26 May I "Gruppe" bombed airfields at Norrent-Fontes and St. Omer and French Army positions at Abbeville and Tournai. was also involved in the Battle of Dunkirk and Siege of Calais, with particularly heavy attacks on Dunkirk from 27 May–2 June. II "Gruppe" bombed Calais on 21 May, but focused on the northern flank, bombing ports and airfields from Zeebrugge to Calais. It intensified attacks on Dunkirk from 24 May–2 June losing six aircraft in that time. On 3 June it was withdrawn to Celle to rest and refit while crews also converted to the Junkers Ju 88. KG 54 sank the 8,000-ton French Navy steamer "Aden" on 27 May. III./KG 54 also centred bombing operations over Dunkirk claiming a destroyer damaged on 1 June before transferring to Germany Adolf Häring was replaced as group commander Kurt Leonhardy.