The images collected through the @Arras95 Twitter campaign have now been put as group on Flickr. You can download, reuse, adapt and republish these images with attribution and for non commercial gain under the project license.
The Battle of Arras: An Image Set on Flickr
Cite : The Battle of Arras: An Image Set on Flickr (http://ww1centenary.oucs.ox.ac.uk/?p=2480) by Kate Lindsay (http://ww1centenary.oucs.ox.ac.uk/author/katharine-lindsay/) licensed as Creative Commons Attribution-Non-Commercial-Share Alike 2.0 UK: England & Wales (http://creativecommons.org/licenses/by-nc-sa/2.0/uk/)
Reuse : Web link