French cannons boomed across the dewy fields of Valmy, echoing through the hills as the fate of the French Revolution hung in the balance. Prussian forces, led by the Duke of Brunswick, had marched into France, determined to restore the monarchy and crush the upstart revolution. But the French, fueled by patriotism and desperation, refused to budge. Under the command of Generals Dumouriez and Kellermann, the French army stood firm, trading artillery fire with the Prussians in a day-long standoff. As the sun dipped below the horizon, the Prussians retreated, their invasion foiled. The victory at Valmy marked a turning point in the Revolution, galvanizing French morale and convincing European powers that the Revolution was not to be underestimated.