 Complete the following phrase:  The Battle of Arras achieved surprise and initial success against overstretched German forces but failed in its objective. Radio communication between tanks and infantry was poor and there was little combined arms co-ordination as practised by the Germans. German defences including FlaK guns and field guns eventually stopped the attack. The French knocked out many German tanks as they retired but the Luftwaffe broke up the counter-attacks and 60 British tanks were lost. The southern attack at Cambrai also failed, because V Corps had been too disorganised after the fighting in Belgium to make a serious effort. OKH panicked at the thought of hundreds of Allied tanks smashing the best forces but Rommel wanted to continue the pursuit. Early on 22 May, OKH recovered and ordered the XIX Panzerkorps to press north from Abbeville to the Channel ports. The 1st Panzer Division advanced to Calais, the 2nd Panzer Division to Boulogne and the 10th Panzer Division to Dunkirk later, the 1st and 10th Panzer divisions roles were reversed. South of the German salient, limited French attacks occurred on 23 May near Peronne and Amiens. French and British troops fought the 