The head of the British Army has issued an unprecedented warning after six troops were arrested over allegations of sexually assaulting a teenage female soldier.

In a video message, Chief of the General Staff General Sir Mark Carleton-Smith said claims of illegal and “downright unacceptable” behaviour had damaged the reputation of the army.

His comments came after six army sports club members were arrested by military police over allegations of a serious sex attack on a sleeping 17-year-old female soldier.

It was alleged that the teenager woke to find the men, who had been drinking – one of whom was a staff sergeant – standing over her.

The armed forces had already faced heavy criticism earlier this week when a video emerged showing soldiers from 3rd Battalion, Parachute Regiment, shooting at an image of Labour leader Jeremy Corbyn during target practice.

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Gen Carleton-Smith said in the video: “Where serious allegations are proven against members of the Army, including allegations of a violent or sexual nature, it demonstrates indiscipline that is wildly at odds with the values and standards that represent the fabric of not just our army but the nation’s army, the British Army.

“Not only is it downright unacceptable, it is illegal and it stands in stark contrast with everything the British Army represents.

“This hasn’t been a good week for the army. It has damaged our reputation, which is exceptionally hard-earned and includes the sacrifice of our friends on the battlefield.

“We all belong to a national institution, something the country is proud of and rightly so – the best of British. And we are proud custodians of that reputation, which needs all of us – each and every one of us – to do better.”

Defence secretary Gavin Williamson said on Saturday he had been left horrified by allegations of sexual assault in the army and had launched an inquiry into behaviour across the armed forces.

“There is no place for these kind of actions in the military and, if true, those involved must be dealt with,” he said.

“I have commissioned a review into inappropriate behaviour in the military with a view to stamping it out.”