Secret letters from a Russian duchess who escaped the royal family's mass execution in 1918 show her hatred of the British for not doing enough to save them.

Tsar Nicholas II - who was related to the British royal family - was executed along with his wife and children in 1918 following the Russian Revolution the year before.

His younger sister, the Grand Duchess Olga Alexandrovna, penned 52 letters to her sister Xenia during this time - providing a chilling insight into the perilous existence of the Romanovs, the last Russian royal family.

She wrote that the Allies were 'all words no actions' and had not done enough to protect her beloved family from 'cold-blooded devils,' in a letter from January 1919.

Secret letters from Grand Duchess Olga Alexandrovna (pictured) show her hatred of the British for not doing enough to save her family, the Romanovs, from execution

Tsar Nicholas II - who was related to the British royal family - was executed along with his wife and children (all pictured) in 1918 following the Russian Revolution the year before

At the time Olga was still in Russia under the protection of the White Army and Xenia was in exile in Crimea.

Olga wrote: 'This life of waiting, uncertainty and horrors will go on for at least a year or two.

'I nearly hate the Allies. When will they help - or won't they. All words and no actions. No tanks yet here - nothing that can help us.'

In another letter she lambasted the 'devils' who slaughtered her 'beloved' family.

She wrote: 'I try to squash the idea: If really those devils could, in cold blood, kill all those innocent people. They have done the same with the beloved family. Oh no! No! it can't be.'

She wrote that the Allies were 'all words no actions' and had not done enough to protect her beloved family from 'cold-blooded devils' in a letter from January 1919

She wrote: 'I try to squash the idea: If really those devils could, in cold blood, kill all those innocent people. They have done the same with the beloved family. Oh no! No! it can't be'

The letters were written mostly in English to get past the censors since the entire Romanov family lived in constant fear of assassination by Bolshevik forces.

After the First World War, the British and French joined the Russian Civil War in support of the anti-Bolshevik White Army, but could not save the Romanovs from execution.

Nicholas II was overthrown during the revolution and he and his family were sent to exile in Siberia.

But they were murdered by Bolshevik troops in a basement in Yekaterinburg, Russia, on July 17, 1918, bringing an end to the 300 year old Romanov dynasty.

In April 1919, with the Red Army approaching the Crimea, King George V sent the British warship HMS Marlborough to the area which brought Xenia to England.

Olga escaped Russia with her second husband and their two sons in February 1920 and settled in Denmark.

At the time Olga was still in Russia under the protection of the White Army and Xenia was in exile in Crimea. Pictured left with her husband Colonel Nicholas Kulikovsky in their living room in 1941 and right, in her nurse's uniform in 1914

The first batch of letters were written from Kiev where Olga worked as a nurse (pictured) caring for wounded First World War soldiers between 1915 and 1917

The collection of letters have belonged to the grandson of Olga who has now decided to put them on the market and they are tipped to sell for £100,000.

DEATH OF A DYNASTY Nicholas II abdicated his throne in 1917 as revolution swept Russia. He and his family were placed under house arrest in Tsarskoe Selo, then evacuated to Tobolsk in the Urals in August that year. The Bolsheviks came to power in October 1917 and by March 1918 the family were forced to live on soldier's rations. The next month, the Red Army moved the Romanovs to Yekaterinburg. There were plans to put Nicholas on trial, but these were scuppered when the city became the target of the rival anti-communist White Army. The Bolsheviks decided to shoot the entire family on July 17 so they could not be rescued by the White Army. They woke them, told them to get dressed and pretended they were being moved from Yekaterinburg away from the oncoming battle. They were shot in a basement and their bodies buried in a pit near the city. Their remains were reburied in 1998 by the Russian government, who gave them a state funeral. Advertisement

Mark Falco, auctioneer at William Gerorge & Co, of Peterborough, Cambs, who is selling the letters, said: 'With the advent of the centenary of the revolution in Russia, the shooting of Tsar Nicholas and the end of the First World War, these letters are important and tell the vital story of the Romanov family in this turbulent time.

'It is fascinating to be able to offer such remarkable pieces of history like this which provide such a detailed personal account of events of such significance.

'The correspondence of 52 letters gives a real snapshot into the events happening over a number of years and the end of the story only makes these more chilling to the reader.'

The first batch of letters were written from Kiev where Olga worked as a nurse caring for wounded First World War soldiers between 1915 and 1917.

She then fled to the Crimea with her second husband, cavalry officer Nikolai Kulikovsky.

In 1948, feeling threatened by Joseph Stalin's regime which had invaded a Danish island, Olga emigrated to a farm in Ontario, Canada. She died in 1960.

Nicholas' mother, Dagmar, was the sister of Queen Alexandra who married Edward VII in 1863.

Their second son, George, Prince of Wales, was Nicholas' cousin. The auction finishes on Sunday.