The River Rhine forms a natural frontier and so the phrase Rhine Crossing, Crossing of the Rhine, or forcing the Rhine may refer to one of several crossings of it.
History
the Crossing of the Rhine from east to west by barbarians in 406, into the territory of the Roman Empire
several times by French troops invading Germany during the Franco-Dutch War, such as:
on 6 September 1795, as commemorated in Louis-François Lejeune's painting First crossing of the Rhine by the French army commander by Jourdan and Kléber, at Düsseldorf in the duchy of Berg, 6 September 1795
from east to west by Prussian and Russian Troops invading France in 1814 near Kaub, as commemorated in Wilhelm Camphausen's painting General von Blücher Crossing the Rhine.
Operation Plunder and Operation Varsity – on 23-24 March. British units participating were granted the battle honour 'Rhine Crossing' by the British Army