A great resource here, a forward planner from UK photo library giant Mary Evans showing upcoming First World War important anniversary 2013 / 2014 with related images.
They say:‘To help you with your projects for the 100th anniversary of the First World War in 2014, we have put together a timeline of the important events of the war and to make it even easier, we have gathered a selection of images on each subject. Just click the link next to the entry to view the images. You will also find a link to some background information on each event should you wish to know more detail. We hope you will find this useful.’
Get planning and licensing WW1 images here