shields


an item that blocks or creats a barrier

I use my umbrella as a shield from the rain. 



Source
https://www.google.com/search?q=trench&es_sm=119&source=lnms&tbm=isch&sa=X&ei=lipjU9bbB461yASVxIKYDw&ved=0CAgQ_AUoAQ&biw=1256&bih=590#q=army+shield&tbm=isch&facrc=_&imgdii=_&imgrc=UVFUWNkVfx2iAM%253A%3B-cZuNjOj3hB7QM%3Bhttp%253A%252F%252F2.bp.blogspot.com%252F-0M28TwyefEI%252FUHuVBSyLY_I%252FAAAAAAAAF44%252Ft6XoddUuOao%252Fs1600%252FShield-wall3.jpg%3Bhttp%253A%252F%252Fwolfhowling.blogspot.com%252F2012%252F10%252F1066-battle-of-hastings.html%3B468%3B320