Original sentence: 2nd/81st had been held in reserve in Brussells since Napoleon's abdication.As the odd battalion out, it was chosen to be the treasure guard in Brussells.Even after the rest of the brigade was ready and on the road, the 2nd/81st was still left behind to guard the hospitals and treasury in Brussells.With the rest of the division, the 2/81st missed the Battle of Qatre Bras on 16 June 1815 because the rest of the brigade had not concentrated in time
Edited sentence: 2nd/81st had been held in reserve in Brussels since Napoleon's abdication.As the odd battalion out, it was chosen to be the treasure guard in Brussels.Even after the rest of the brigade was ready and on the road, the 2nd/81st was still left behind to guard the hospitals and treasury in Brussels.With the rest of the division, the 2/81st missed the Battle of Quatre Bras on 16 June 1815 because the rest of the brigade had not concentrated in time