During the
War of the First Coalition waged against the French Revolution, European monarchies such as Austria and Prussia, financed by Britain, attempted to invade France and restore the abolished French monarchy. Fighting raged on multiple fronts, from the Pyrenees to the Alps, the Rhine and Flanders (approximately modern Belgium). Flanders, then owned by Austria, was a key theatre of the war due to its relatively open terrain and its proximity to the French northern border, which was the only sector where there was no strong natural defensive boundary to protect from invasion. By 1794, both sides had already fought over it for years. The Allied Coalition army of Austrians, British and Dutch troops aimed to use it as an invasion route to Paris, while the French armies defending that sector aimed to push them back and capture a natural defensive boundary that would protect France in the north while forcing the Allies to make peace. Austrian diplomats decided to abandon the Low Countries after the battle, and began to plan for a retreat to the Meuse to exit the theatre to the east. This Austrian strategic decision created serious division in the Allied ranks, as the Austrian, Dutch and British forces had very different strategic priorities and lines of retreat from the start. While the Austrian priority was to ultimately defend the Rhine and Germany in the east, the British and Dutch priority was to defend the Netherlands to the north. This ultimately led to the Austrian and Anglo-Dutch contingents going their separate ways.
Coburg's retreat to the Meuse After Fleurus, Jourdan's forces at Charleroi, most of which were still nominally under the command of Pichegru, were officially constituted as the
Army of Sambre-and-Meuse on 29 June by the Committee of Public Safety which then governed France, and placed under the full command of Jourdan. The Army was given the objective of defeating the Austrians where possible, and ultimately to secure the Meuse river, as the minister of war, Lazare Carnot, saw it as the ideal defensible natural boundary on which to anchor France's northern frontier after a peace settlement However, at the same time, Jourdan was ordered to detach between 30,000 and 40,000 of his approximately 140,000 strong field force under General
Barthelemy Schérer to retake the interior fortresses of Landrecies, Le Quesnoy, Valenciennes and Conde, Allied footholds in France which were now isolated by the victory at Fleurus and the Allied withdrawal. On 1 July, Jourdan commenced his offensive by capturing Mons with his left wing, driving away the Dutch defending the city. This had been the main objective of the attacks on the Sambre throughout the spring of 1794, and its capture cut the direct line of communication between the interior fortresses held by the Austrians, and their main base in Brussels. On 2 July, he advanced it further and captured
Soignies, forcing Prince Coburg's right wing back to
Braine-le-Comte. On 6–7 July, Jourdan's centre launched attacks along Coburg's entire line from Braine-le-Comte to
Gembloux, which caused Coburg to abandon his plan to defend Brussels, and retreat further eastwards to Malines (modern
Mechelen) and Louvain (modern
Leuven). From 7 to 8 July, the right wing of the Army of Sambre-and-Meuse attacked Coburg's left wing, which was still anchored on the city of
Namur on the Meuse. Forcing it back to Ramillies and isolating Namur, Jourdan then besieged Namur while entering Brussels in triumph alongside Pichegru on the 10th. Fearing Jourdan would advance along the Meuse via Namur and Liege and cut off his retreat, Coburg pulled his centre and left wing back further, to Tirlemont (modern
Tienen). Together with 18,000 men from Pichegru, the rest of whose Army of the North was away besieging
Sluys, Jourdan attacked Coburg's line, capturing Louvain on 15 July and Jodoigne either on the 16th or 17th. Meanwhile, Namur, which had been under siege, surrendered on the 19th. This attack split the Allied army into two operationally separate units for good. Pichegru's capture of Malines on the 15th caused the Dutch army defending that sector to retreat north to defend their home together with the British troops under the Duke of York, while Coburg decided to pull his army east towards the Meuse to defend the Rhine and Germany. Coburg crossed the Meuse at
Maastricht on 24 July, and occupied a defensive line along the east bank. == Prelude to battle ==