Leopold, the successor of his brother, displayed much sagacity and moderation in the measures which he adopted for the recovery of the revolted provinces; but their internal disunion was the best ally of the new emperor. The violent party which now ruled at Brussels had ungratefully forgotten the eminent services of Vander Mersch, and accused him of treachery, merely from his attachment to the noble views and principles of the widely-increasing party of the Vonckists. Induced by the hope of reconciling the opposing parties, he left his army in Namur, and imprudently ventured into the power of General Schoenfeld, who commanded the troops of the states. Vander Mersch was instantly arrested and thrown into prison, where he lingered for months, until set free by the overthrow of the faction he had raised to power; but he did not recover his liberty to witness the realization of his hopes for that of his country. The states-general, in their triumph over all that was truly patriotic, occupied themselves solely in contemptible labors to establish the monkish absurdities which Joseph had suppressed. The overtures of the new emperor were rejected with scorn; and, as might be expected from this combination of bigotry and rashness, the imperial troops under General Bender marched quietly to the conquest of the whole country; town after town opening their gates, while Vander Noot and his partisans betook themselves to rapid and disgraceful flight. On the 10th of December, 1791, the ministers of the emperor concluded a convention with those of England, Russia, and Holland (which powers guaranteed its execution), by which Leopold granted an amnesty for all past offences, and confirmed to all his recovered provinces their ancient constitution and privileges; and, thus returning under the domination of Austria, Belgium saw its best chance for successfully following the noble example of the United Provinces paralyzed by the short-sighted bigotry which deprived the national courage of all moral force.
Leopold enjoyed but a short time the fruits of his well-measured indulgence: he died, almost suddenly, March 1, 1792; and was succeeded by his son Francis II., whose fate it was to see those provinces of Belgium, which had cost his ancestors so many struggles to maintain, wrested forever from the imperial power. Belgium presented at this period an aspect of paramount interest to the world; less owing to its intrinsic importance than to its becoming at once the point of contest between the contending powers, and the theatre of the terrible struggle between republican France and the monarchs she braved and battled with. The whole combinations of European policy were staked on the question of the French possession of this country.