  N-body simulations are used to model the tidal disruption of the Sagittarius
(Sgr) dwarf galaxy with constraints set by the positions and velocities of M
giants in the Sgr tidal arms recently revealed by the Two Micron All-Sky Survey
(2MASS). The simulated Sgr dwarf is placed on a variety of orbits within a
Milky Way potential parameterized by variable circular velocities, halo
flattenings and radial profiles. Two hundred separate test particle orbits have
been used to explore a wide range of model Milky Way potentials and dwarf
galaxy characteristics. The family of models is delimited by the data to a
relatively narrow allowed range of parameters, and then input into N-body
simulations. We present our best-fitting model, and discuss the orbital period,
apoGalacticon distance, current space velocity, mass-to-light ratio, and other
characteristics of the Sgr dwarf. In addition, we discuss the implications of
this model for the flattening of the Galactic halo.
