 Complete the following phrase:  With assets being moved between Polforce and Macforce, the division was unable to fight as a cohesive entity. The divisional history, written by division staff, stated the brigades fought confused, independent and onesided battles. Most notably, they record the 137th Brigade suffering grievous casualties when German forces broke through their positions on the La Bassée Canal. Meanwhile, with the BEF surrounded and the military situation in Flanders having deteriorated, the decision was made to 