in july 1929, the border defence corps was reorganised. six additional regiments were created, and all the existing units were renamed. each brigade was attached to part of the polish border which was further divided into battalion areas organised around small forts along the border. in turn, each of the battalions commanded several smaller strongholds and outposts organised by companies. all the rear troops (including the engineers, artillery and cavalry) formed the second line of the defence and were to be used as a mobile reserve. the brigades were given new names, after the area they were stationed in: