This essay considers whether the just war tradition is compatible with Christian theologically grounded conceptions of mercy. After considering and rejecting positions that pit mercy and war against each other, the essay mines the work of Walter Kasper and James Keenan on Christian mercy to develop a position that reimagines mercy as compatible with traditional just war criteria. In particular, this analysis leads to the conclusion that Christians may endorse just war in the form of humanitarian intervention. By doing so, (...) they allow mercy to temper the aspects of warfare that diminish the humanity of others. (shrink)