Chelsea Manning, 28, the ex-US-soldier who gave thousands of secret army documents to the website WikiLeaks in 2010, is now appealing her 35-year prison sentence.

Manning was an intelligence analyst in Iraq when she leaked videos of airstrikes, U.S. diplomatic cables and 482,832 army reports that would become known as the Iraqi War Logs and Afghan War Diary.

She was sentenced on 21 charges in 2013 - but now her lawyers are appealing, saying that she acted in the interests of the public and doesn't deserve the 'harsh' sentence, ABC reported.

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Appeal: Chelsea Manning (pictured), 28, is appealing the 35-year-sentence she was given in 2013 for releasing classified documents, including videos of bombings and private correspondence, to Wikileaks

Guilty: Manning - pictured here after being found guilty, and before beginning the transition into a woman - claimed to have shared the information to reveal how poorly the war in Iraq and Afghanistan was going

'For what PFC Manning did, the punishment is grossly unfair and unprecedented,' the appeal, filed Wednesday, said. 'No whistleblower in American history has been sentenced this harshly.'

Her lawyers hope to get the court to either reduce her sentence to ten years or dismiss the charges entirely, Manning said on her blog.

The reasons she gave for the appeal were being placed in solitary confinement before her trial - described as 'deplorable' and 'unconstitutional' by her lawyers - the use of 'vague evidence' for sentencing and a 'lack of evidence on charges of theft of information'.

She also cites a 'vague definition of "exceeding authorized access"' in the Computer Fraud and Abuse Act and a 'lack of proof' that U.S. interests were harmed by the leak as additional reasons.

'Throughout trial the prosecution portrayed PFC Manning as a traitor and accused her of placing American lives in danger, but nothing could be further from the truth,' the appeal said.

It added that she released the documents because she 'believed the public had a right to know about the toll of the wars... the loss of life, and the extent to which the government sought to hide embarrassing information of its wrongdoing.'

Manning announced the appeal on her Twitter account, saying 'My fight is far from over. I am only just getting started.'

The American Civil Liberties Union (ACLU) has written in defense of Manning, saying that her conviction was 'unconstitutional,' ABC reported.

It said the Espionage Act is 'unconstitutionally vague,' because it gives the U.S. government a tool 'to subject speakers and messages it dislikes to discriminatory prosecution'.

It also said that the act was used unconstitutionally when the judge refused to allow the court to consider whether the leaked documents might have been so valuable to public discussion that they justified the leak.

Manning had originally been charged on 22 counts, but was acquitted of 'aiding the enemy,' which carried a potential death sentence.

She is currently serving her sentence at the army's maximum security Fort Leavenworth detention facility in Kansas.

She was born Bradley Manning, a male, and began transitioning into a woman after the conviction.