Download a free PDF of the compilation. It includes 11 Skill Challenges for use in campaigns revolving around war.
From the introduction:
War means change. Sometimes for the better, often for the worse. The role that player characters play in a campaign set against the backdrop of war may be one of aggression, of peace, or it may be that the ongoing war merely provides a backdrop, and nothing more, for an ongoing story that has little to do with the larger conflict.
This series will cover war-time campaigns and provide skill challenges for war-time campaigns