General Wilson's staff was looking at risks that might impact the withdrawal from Greece. They seem to have been concerned about a German movement, usihg the Delphi Pass. They worried that the Germans might block thr path for the retreat from Greece. The Greek headquarters issued orders to a protective force. They were sent to Navpaktos. An officer training unit was sent to Patras with "some field guns". The remnants of the 4th Hussars was also ordered to Patras. Air reconnaissance noticed vehicle movement from Yannina. Late-breaking news reported "hundreds of vehicles moving south".
General Blamey decided that the needed to "demolish the road at Delhi" and put troops in place to "defend the demolitions." He also had Brigadier Steele "to damage the road". Lt-Col. King's column travelled all night with their vehicle lights turned on, apparentlt to draw attention to themselves. At dawn, they were located "three miles west of Levadis". They were protecting the denmolition work.
This is based on the account in "Greece, Crete, ans Syria" by Gavin Long.