Original sentence: During the so-called 100 Days of 1815, a largely Prussian force under the command of Gebhard Leberecht von Blücher contributed to the allied victory at Waterloo (18 June 1815)
Edited sentence: During the so-called 100 Days of 1815, forces of the Seventh Coalition, including an Anglo-Allied army under the command of the Duke of Wellington and a Prussian army under the command of Gebhard von Blücher were victorious at Waterloo (18 June 1815)