  We report the discovery with Chandra of X-ray-emitting gas associated with
the jet-cloud interaction in the radio galaxy 3C 277.3 (Coma A), a source that
falls in the most important power range for radio-mode feedback in the
Universe. This hot gas, heated by the jet, dominates the mass of the cloud
which is responsible for an extreme projected deflection of the kpc-scale radio
jet. Highly absorbed X-ray emission from the nucleus of 3C 277.3 confirms that
the jet lies close to the plane of the sky and so has a large intrinsic
deflection. We detect group gas on the scale of the radio lobes, and see X-ray
cavities coincident with the brightest radio emission, with the lobes embraced
by X-ray enhancements that we argue are the result of shocks. The
anti-correlation between the locations of X-ray arms and H$\alpha$-emitting
filaments that are believed to have originated from a merger with one or more
gas-rich galaxies suggests that shocks advancing around the lobe are inhibited
by the dense colder material. Synchrotron X-ray emission is detected from the
upstream edge of a second bright radio knot. X-rays are also detected from the
location where an undetected counterjet enters the northern radio hotspot. We
suggest that these X-rays are synchrotron radiation from a shock in a
small-scale substructure.
