The search function works pretty well, as I looked up "Light Brigade", "Kings Mountain" and "Spitfire" or "Mustang" just to see what was on there. I didn't research any guns or cannons -- yet, that is... I can't say it's an encyclopedia-type site that's all-inclusive, but the articles I did see there were very well researched and written, with excellent images accompanying them.
Knowing there are many history buffs -- and firearms enthusiasts -- on this forum, I wanted to call attention to this website on its own posting. Goodluck, and enjoy!
Old No7