Hms Centurion Target Ship

Think I can see a few small holes in this ship so probably only small caliber weapons used when it was fired upon.

HMS Centurion was the second of four King George V-class dreadnought battleships built for the Royal Navy in the early 1910s. She spent the bulk of her career assigned to the Home and Grand Fleets. Aside from participating in the failed attempt to intercept the German ships that had bombarded Scarborough, Hartlepool and Whitby in late 1914, and the Battle of Jutland in May 1916, her service during the First World War generally consisted of routine patrols and training in the North Sea.
Centurion was scuttled as a breakwater during the Invasion of Normandy off Omaha Beach on 9 June 1944 to protect a mulberry harbour built to supply the forces ashore.
https://en.wikipedia.org/wiki/HMS_Centurion_(1911)