In 1953, Lionel Ellis, the British official historian wrote that the attack at Arras succeeded in easing German pressure round Arras and delaying the encirclement of the BEF. The ground between Arras and the Cojeul was re-occupied and there was no serious German attack on the town, Rommel making the alarmist claim that the attack was made by five divisions. Beyond the delay imposed on German moves and the many casualties inflicted on the Germans, the attack was bound to fail without a force sufficiently powerful to follow up and consolidate the captured ground. Rundstedt, the commander of Army Group A, had intended that the panzer divisions should rest after the exertions on 20 May. In 1978, Cooper wrote that the attack at Arras led to the German higher commanders to continue to attack northwards, to capture the channel ports.