that the Allied attacks on the Abbeville bridgehead lacked co-ordination, which contributed to the Allied failures to overcome German defences and magnified the effects of lack of preparation, the persistent underestimation of the strength of the German positions south of the Somme. The Allies were in ignorance of the assembly of Army Group B on the north bank of the Somme, the German formation preparing for , which was due to begin on 5 June, against Allied positions from Caumont to Sallenelle on the coast, south of St Valery. In 2001, Caddick-Adams wrote that when the 51st (Highland) Infantry Division arrived from the Saar and relieved parts of the 4e DCr, 2e DLM and 5e DLM, it had a front of to hold. When began on 5 June, the Tenth Army units opposite the German bridgeheads from Abbeville to the sea were pushed back to the Bresle and further back on 8 June. Defeatism spreading through the French army was reflected in the Tenth Army HQ, which ceased to operate from Robert Forczyk, in his 2017 book "Case Red: The Collapse of France", called the Battle of Abbeville an Allied fiasco. The German bridgeheads has not been destroyed and a British and two French armoured divisions had been depleted by the loss of 200 tanks and 2,000 infantry, in which state they were incapable of forming a mobile reserve to defend the Weygand Line. The German were able to use the bridgeheads as springboards despite their reduced size. Casualties On 27 May, the attacks of the 1st Armoured Division, 2e DLC and the 5e DLC cost the British knocked out and another out of 180 tanks engaged, about half of the losses from German fire and the rest from mechanical breakdowns. German casualties amounted to forty men killed and 110 wounded or missing. From the 4e DCr lost but managed to inflict a measure of "tank panic" on some German troops. When they realised that the French tanks were impervious to their 37 mm anti-tank guns the Germans tried to retreat; outside Huppy 25 troops surrendered to the French. On the right flank of the attack, much of III Battalion IR 217 was lost with 59 men killed and 200 taken prisoner. in two days the Germans lost twenty anti-tank guns. By the morning of 30 May the 4e DCR had been reduced to about forty R35 and H39 light