By 16 April 1941, the Greeks were ready to surrender

The Greek generals had been asking the Prime Minister to give up the fight. By 16 April 1941, the Bishop of Yannina made the same request of Mr. Koryzis. By 15 April, General Wavell had warned General Wilson that they should prepare to retreat further. At this point, the only place to go was to board the ships and leave Greece. The British and Commonwealth troops were in Thessaly on 17 April, where it was rainy and the skies were filled with marauding German aircraft. There were often conflicts on the roads between the supply vehicles carried supplies forward and the troop-carrying vehicles trying to withdraw. Since 14 April, the Germans had been firing in the trucks with machine guns from aircraft. The men had become extremely nervous and at the first sign of aircraft, they would jump off the vehicles to the roadside. This is based on the account in Vol.II of the Australian Official History.