A play on Shakeseare's "Cry havoc and let slip the dogs of war" -- a 'bitch of war' is a female variant of a 'dog of war.' The phrase was coined by political poet Ian Reed with regard to U.S. presidential candidate, Senator Hillary Clinton, in his poem 'Down-Hill' (April 2008).
Yet star-struck Democrats in chorus call,
applaud her and cheer the more,
unleash the warlike Hillary,
let slip the bitch of war."