Elite Dangerous: my anaconda getting utterly toasted by a federal capital ship

went to do a flyover of a federal capital ship, when i noticed something hit it on the far side of my screen...so, I thought id help out and see what it was, so i did a flyover the rear end and then out of nowhere i was being fired upon from its escort ships AND the capital ships big batteries....and dam, they took me out pretty quick which was saying something considering how much of a beating my ship usually takes