What were the weather conditions? If you have a lock on the periscope it can be lost in seconds by a wave washing over the scope, and it will stay in the postion that the scow was in before the wave washed over. Other than that, the C2 could have changed speed quickly, which has happened to me a few times, which is annoying when you launch a 4 tube salvo.
In what way did they miss? Did they go under, to the side or just bounce off??