sentences:  Although invited, he and his wife, who had arrived a day or two before, were unable to go to the Duchess of Richmond's ball.On the 17th when the allied army retreated from Quatre Bras to Waterloo he allocated the positions that the troops were to occupy by ordering stakes placed in the ground where the regiments were to be for the next day's battle, which according to S. G. P. Ward writing in the Oxford Dictionary of National Biography was "to the rear, apparently, of the ground originally chosen by the duke".On 18 June 1815, during the Battle of Waterloo, while he was talking to the Duke of Wellington, De Lancey was struck in the back by a ricocheting cannonball leaving his skin unbroken but causing fatal internal injuries.