Craig Stormey was on an alpine skiing course with the 7th Parachute Regiment Royal Horse Artillery in the Stubai Valley, Austria, when the horrific assault took place.
Speaking at the Tyrolean court in Innsbruck,a spokesperson said that the 30-year-old soldier entered the girl's unlocked family home while drunk in the early hours of the morning.
He then stripped off and started to perform sexual acts on the sleeping child.
According to the Mail Online, the girl's father told the court: “I was lying in my bed and saw a figure holding a child in his arms.
“I was half asleep and first thought it was my wife but then I realised she was lying next to me.
“Then I saw the naked stranger in another room with my daughter. I completely flipped and hit him several times in the face.”

During the fight, his wife and their daughter fled the house as he called the police.
He added: “Our daughter has managed to cope with the incident relatively well. But she has a very good memory.”
The Afghanistan veteran pleaded guilty, but said that in large part he did not remember what happened that night
An MoD spokesman has said an application would be made to discharge the soldier.
According to the BBC, they said: "We can confirm that a British soldier has been convicted in Austria of the rape of a minor and assault of a state authority and sentenced to nine years' imprisonment.
"In line with normal procedure when a soldier is sentenced to imprisonment, an application will be made for his discharge from the Army."
Stock images used throughout.