  We report the first science results from the newly completed Expanded Owens
Valley Solar Array (EOVSA), which obtained excellent microwave imaging
spectroscopy observations of SOL2017-09-10, a classic partially-occulted solar
limb flare associated with an erupting flux rope. This event is also
well-covered by the Reuven Ramaty High Energy Solar Spectroscopic Imager
(RHESSI) in hard X-rays (HXRs). We present an overview of this event focusing
on microwave and HXR data, both associated with high-energy nonthermal
electrons, and discuss them within the context of the flare geometry and
evolution revealed by extreme ultraviolet (EUV) observations from the
Atmospheric Imaging Assembly aboard the Solar Dynamics Observatory (SDO/AIA).
The EOVSA and RHESSI data reveal the evolving spatial and energy distribution
of high-energy electrons throughout the entire flaring region. The results
suggest that the microwave and HXR sources largely arise from a common
nonthermal electron population, although the microwave imaging spectroscopy
provides information over a much larger volume of the corona.
