 Complete the following phrase:  He obtained a commission in the 43rd Monmouthshire Regiment of Foot Light Infantry later the 1st Battalion, Oxfordshire and Buckinghamshire Light Infantry in 1806, and he was promoted to lieutet a few months later. He saw active service for the first time in the Mediterranean and at Copenhagen, in 1806 and 1807 respectively. The 43rd was one of the earliest arrivals in Spain when the Peninsular War broke out, and Brown was with his regiment at 