Sister Agnes-Marie Valois known as the White Angel has died aged 103 (Michel Spingler /AP)

A 103-year-old French nun known as the “White Angel” who helped allied soldiers during a failed Second World War raid has died.

Authorities in the city of Dieppe in Normandy said a tribute to Sister Agnes-Marie Valois will be held on April 24 at the Canadian cemetery.

Most of the soldiers injured and killed during the August 19, 1942 raid in Dieppe were Canadian, as were the troops the nun and nurse cared for.

Dieppe Mayor Nicolas Langlois said flags have been put at half-mast in the city to pay tribute to “a great lady of our history”.

Valois, who also worked as a nurse at the Dieppe hospital, was living in retirement at a monastery when she died on Thursday.

PA Media