What are some pieces of information for WW1, for Russia in Modern warfare and Trench warfare?

Answer 1

There are many good sites in here for WWI:
http://www.google.com/search?q=wwi&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

http://warfare.ru/
http://www.popularmechanics.com/technology/military_law/4277747.html

http://www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&hs=4xO&as_q=trench+warfare&as_epq=&as_oq=&as_eq=&num=10&lr=&as_filetype=&ft=i&as_sitesearch=&as_qdr=all&as_rights=&as_occt=any&cr=&as_nlo=&as_nhi=&safe=images