 Complete the following phrase:  By now, the RAFs fighter squadrons were withdrawing from France and on 20 May 210 Bty, accompanied by the two Trps of 8 SL Bty, was ordered to withdraw from Conteville and Crecy. 2nd SL Regiment lent towing vehicles to get the guns away. Initially they were ordered to Saint-Pol, then to Saint-Omer and finally to move south-west to Rouen to come under 3 AA Bde. However, 2nd Panzer Division was already in Abbeville blocking the way, and the battery had to fight a rearguard action with enemy ground troops to get to the coast at Boulogne. Although it had to abandon its guns, they had been disabled and the battery had got away with all the instruments and breechblocks. One officer and eight other ranks had been lost in the rearguard action. The battery left Boulogne before it came under attack and made it back to Dunkirk, where the BEF was preparing its evacuation 