I./KG 55 moved again to Malmsheim near Stuttgart. The formation attacked Soissons on 15 May and Reims on 18 May supported by II./KG 55. III./KG 55 was confined to more northern operations: attacking Verdun on 16 May and flying the only known mission of the unit in the Battle of Belgium, to Charleroi, three days earlier on 13 May before moving to Eutingen on 24 May. Through May, KG 55 operated were engaged against targets in central, southern, and eastern France. The unit did not participate in the battles against the British forces in the Battle of Dunkirk and Lille. KG 55, was however involved in anti-shipping operations in the English Channel. On 1 June it was transferred to IV "Fliegerkorps" to participate in these operations.