Germans out of Grand Bois and reached their objective on high ground to the east at noon. The 1st Gordon was assisted by a system of Very light signals worked out with the artillery, which enabled them to direct the artillery onto German machine-gun nests. With the Germans still on the high ground north-west of Caubert, the area was untenable and the 1st Gordon were ordered back to their start line. Aftermath Analysis Confusion over Franco-British command arrangements south of the Somme was to an extent sorted out on 25 May, when the 51st (Highland) Division was subordinated to Ihler, the IX Corps commander, part of (Altmayer) of the Seventh Army (Frère) and the 1st Armoured Division to , which then became the Tenth Army. Military Mission 17, led by Lieutenant-General James Marshall-Cornwall, joined the Tenth Army HQ to co-ordinate British operations with the French. The inadequacy of command arrangements was exposed by the unrealistic expectations of the French of the 1st Armoured Division, which was equipped with fast, lightly armoured, light and cruiser tanks, not the thickly armoured types in French armoured divisions. Altmayer still used the 2nd and 3rd Armoured brigades in the attack on 27 May, which cost the British for little gain in ground and which had to be given up for lack of infantry to consolidate. When the 4e DCr attacked from 28 to 30 May, the German anti-tank guns shot away tank aerials and pennants but bounced off the armour. Some German troops panicked and ran away, captured and the French retook about half of the Abbeville bridgehead. The Allies had too few infantry to hold the captured ground and ended back on their start lines, minus the tanks of the 4e DCr. Allied attacks suffered from a chronic lack of tactical communication, caused by an inadequate number of radios. Tanks, infantry and artillery could not stay in contact or talk to their divisional headquarters and inter-army tactical liaison was only possible at the lowest level. On 4 June, French tanks drove onto a minefield in an area thought to be held by the 51st (Highland) Infantry Division. The Highlanders had been withdrawn during the evening of 3 June and had failed to notify the French troops on the flanks; German troops followed up and planted the mines in an obvious tank avenue between woods. In 1953, the British official historian, Lionel Ellis, wrote