The Dagenham Invincibles were the greatest women’s football team of World War One and heralded as ‘The Unbeaten Women Champions of the Country’. However, in 1919, the factory girls hung up their boots and their triumphs faded into obscurity. In 2023, their war-cry is heard in the roar of the Lionesses as they embark on their World Cup journey. For teenager Maya in Invincibles, it’s the event of the summer as she cheers for England and unearths long-lost footballing secrets.