 Complete the following phrase:  The convoy of troopships arrived at Alexandria on 25 September, and from mid-October the divisional engineers were working on the Suez Canal defences. 11st Fd Co built a floating bridge across the canal using Red Sea fishing boats, the Signal Co set up communications for the Cairo defences and trained infantry signallers. Early in 1915 the signal establishment was increased to provide a section for the divisional artillery HQ. The companies were withdrawn for training after Christmas, but returned to the canal defences when the Turkish Army carried out a 