Oil on canvas. The large scene is set outside a rocky fortress and features a garrison of soldiers preparing for battle: in the foreground on the left, near a tree, the group of commanders on horseback observe the work and give orders, while the troops arm the cannons on the ramparts, prepare rudimentary lances and sharpen their sidearms. The colors are clear and dull, with shades of gray that pass from the clear sky with clouds to the rocky fortress, to get lost in the ground, turning to a sandy beige; only a few of the officers' uniforms stand out, breaking the chromatic uniformity. Restored and relined, the painting is presented in a golden frame from the early 1900s.