U9 launched 22Feb1910. Broken up 1919 (Newport?). I've found 4 pics. on www.battleships-cruisers.co.uk/u-boats.htm. None of them mount the long modern looking gun. I presume the gun was fitted later in WWI. Don't know where the UB suffix comes from although no doubt means Untersee Boot. I thought that both in WWI and WWII they were U and number.

Roger

An updated version of this article which has additional information and pictures a is available for you to download.

The History of Chepstow's Unique War Memorial
http://www.forest-of-dean.net/joomla/stories-and-articles