 The Army's current regimental numbering system dates from this act.Six of the old regiments (4th, 9th, 13th, 21st, 40th and 46th) were consolidated into the new 5th Regiment, which was organized on 15 May 1815 under the command of Colonel James Miller.The current 5th Infantry traces its actual origins to the oldest of these regiments, the 4th, which was organized in May–June 1808.