The 4th Regiment of Chasseurs à Cheval was founded during the re-organisation of the army in 1913, and was thus the youngest cavalry unit of the Belgian army. It participated in World War I and helped the Second Army Division in a reconnaissance role. It distinguished itself during the Siege of Antwerp between 30 August and 8 October 1914. During the second break-out of Antwerp, the 4th Chch made it as far as the surroundings of Leuven. During the retreat of Antwerp, its defense of the Lisse canal, near Somerghem on 12 October 1914, was able to repulse an enemy attack, though with significant losses. Thanks to this, the Division was able to retreat intact to Bruges. The regiment adapted to the trench warfare of the Yser Front as an infantry regiment. It was dissolved in February 1918, though it was resurrected in 1919. From October 1921 it was based in Mons. Another reorganization of the army in 1923 lead to its second dissolution on 3 August. It was not re-mobilized during the Second World War, though former members of the regiment served in other units.