  A review of recent state-of-the-art pulsed field experiments performed on
URu$_2$Si$_2$ under a magnetic field applied along its easy magnetic axis
$\mathbf{c}$ is given. Resistivity, magnetization, magnetic susceptibility,
Shubnikov-de Haas, and neutron diffraction experiments are presented,
permitting to emphasize the relationship between Fermi surface reconstructions,
the destruction of the hidden-order and the appearance of a spin-density wave
state in a high magnetic field.
