Apparently hit pylon cables, some pretty ugly damage to the front of the aircraft.
https://www.dailymail.co.uk/news/article-8579593/Chinook-crew-lucky-escape-RAF-helicopter-hits-countryside-power-lines-exercise.html
The huge troop-carrier chopper normally seen in action on the frontline stunned the quiet village when it cut off power to nearby houses.
A suspected 'wire strike' is thought to be responsible for the heavy-lifting helicopter coming down in a field on the edge of the Welsh village.
John Davies, 81, said: 'This is not a warzone - it's a very quiet village, nothing exciting usually happens and there's not a lot going on.
'But all hell broke loose, the electricity went off and we heard a loud noise.