The situation unfolds in Greece in April 1941

Around 5 April 1941, General Wilson had been told that the 7th Australian Division and the Polish Brigade would not be sent to Greece. Of the troops actually in Greece, most were not deployed where he had wanted. Greece was a spent force and would not count for much. Yugoslavia was in political turmoil after the coup which forestalled the attempt to join the Axis. The entire British campaign in Greece became a withdrawal. There was never a decent prospect of being able to face the Germans and fight in place. The Yugoslav army in the south was rapidly beaten. That allowed an open path to the Germans to enter Greece through Monastir. General Wilson changed his deployment, but his resources were meager enough that his left flank was dangerously exposed. This is based on the account in Vol.II of the Official History.