Quatre Bras
On 15 June as the Prussian I Corps withdrew towards Ligny, there was a danger for the Coalition forces that Ney would be able to advance through Quatre Bras and take his objectives with little or no Coalition opposition. At the headquarters of the I Corps at Genappe (about five kilometres (3 miles) from Quatre Bras), Major-General Jean Victor de Constant Rebecque, chief of staff to the Prince of Orange, realized the danger and ordered Lieutenant-General Hendrik George de Perponcher Sedlnitsky, the commander of the 2nd Dutch Division, to dispatch his 2nd Brigade (Prince Bernhard of Saxe-Weimar-Eisenach) to occupy Quatre Bras. This brigade, consisting of two regiments from Nassau, arrived at about 14:00 on 15 June. Prince Bernhard was able to deploy prior to the arrival of the first French scouts, lancers of the Guard Light Cavalry Division (Lefebvre-Desnouettes) who approached Quatre Bras. These French lancers were engaged at Frasnes, after which the Nassauers retreated to the Bois de Bossu, a thick patch of forest near Quatre Bras."6:30 p.m.--some accounts say 5:30" General Lefebvre-Desnouëtte requested infantry support, but as night was approaching, and his infantry was strung out along Brussels-Charleroi road, Ney declined the request, instead deciding to camp for the night and approach Quatre Bras in force the following day. Early on the evening of 15 June, instead of obeying Wellington's order to concentrate the I Corps at Nivelles (which would have meant that the force occupying Quatre Bras would be abandoning the position), Rebecque ordered the 1st Brigade (Count of Bylandt) of the 2nd Dutch Division to reinforce Prince Bernhard's 2nd Brigade. Because they disobeyed a direct order from Wellington, the Dutch generals were responsible for the Battle being fought at Quatre Bras on the following day.