Dumouriez, intent on invading the Austrian Netherlands, advanced late in the season and attacked the Austrians with greatly superior forces. Jemappes was won by costly but effective charges against the Austrian's prepared position. Dumouriez overran the Austrian Netherlands within a month, but lost it at the Battle of Neerwinden in March. The French would not reconquer the Austrian Netherlands until the summer of 1794.
For a description of the battle and the tactics used by the French, see John A. Lynn, The Bayonets of the Republic: Motivation and Tactics in the Army of Revolutionary France, 1791-94 (Boulder, CO: Westview Press, 1996).
References
Pope, Stephen. The Cassell Dictionary of the Napoleonic Wars, Cassell (1999)