On 6 April 1941, Germany came to the aid of Italy and invaded Greece through Bulgaria and Yugoslavia. Greek and British Commonwealth troops fought back but were overwhelmed. On 20 April, after Greek resistance in the north had ceased, the Bulgarian Army entered Greek Thrace, without having fired a shot, with the goal of regaining its Aegean Sea outlet in Western Thrace and Eastern Macedonia. The Bulgarians occupied territory between the Strymon River and a line of demarcation running through Alexandroupoli and Svilengrad west of the Evros River. The Greek capital Athens fell on 27 April, and by 1 June, after the capture of Crete, all of Greece was under Axis occupation.