The most decisive German effort seems to have been made on the 20th April. Those forces which had already on the day before reached the plain of Thessaly advanced on Lamia, whilst German motorised forces struck across the Pindus Mountains from Grevena and reached the Yannina area. At the same time, the roads of withdrawal of the Imperial and Greek forces were attacked by dive-bombers with fighter escort, whilst similar attacks were made on the harbour of Piraeus.

















