Not On Our Watch, an organization that raises awareness of the crisis in Darfur and similarly troubled regions and was founded by Ocean's Thirteen stars George Clooney, Brad Pitt, Matt Damon and Don Cheadle, and producer Jerry Weintraub, announced on Thursday that a $750,000 grant has been made by the aformentioned quintet to Oxfam's humanitarian efforts in Darfur and neighboring Chad.