Allen continued to serve the additional 6-month terms with installation dates on September 11, 1820; December 29, 1820; and May 10, 1821. While in session in Corydon, Indiana on September 13, 1821 the Grand Lodge of Indiana issued the charter for Terre Haute Lodge and it was issued the number 19 and was the 19th successive Lodge chartered by the Grand Lodge of Indiana. The charter was signed by Grand Master John Sheets, Deputy Grand Master Jonathan Jennings, Senior Grand Warden Thomas Precy, Junior Grand Warden John W. Dunbar, and Grand Secretary William C. Keen. The officers named on the charter for the ensuing 6-month term were: Demas Deming, Worshipful Master; Curtis Gilbert, Senior Warden; Robert Sturgus, Junior Warden. The named officers were installed on the same day that the charter was dated, September 13, 1821. Peter Allen would serve two additional terms as the presiding officer in 1823, installed on May 19, and in 1825, installed on October 2. War of 1812: On May 28, 1812 Peter Allen was appointed as the commanding Lieutenant Colonel commanding the 20th Regiment Detached Militia, drawn from the various companies in Ontario County, as well as his own 22nd Regiment of Infantry (Allen's Regiment), New York State Militia, both under the command of Major General Stephen Van Rensselaer who was in command of the First Division of the New York State militia, which consisted of the Fourth through Eight Brigades. Lieutenant Colonel Allen was captured by enemy forces on October 13, 1812 at the Battle of Queenston Heights and was honor bound to not take up arms until he had been informed of a prisoner swap that released him. On December 10, 1814 Allen was discharged from the New York State Militia due to a consolidation of forces. Peter Allen served Honeoye, New York as its County Supervisor in the Ontario County Legislature in 1812 until he received his commission as Lieutenant Colonel commanding the 20th and 22nd Infantry Regiments for the War of 1812. After returning home from the War of 1812, Allen was elected to the New York State Assembly as the representative from Ontario County (Democratic Republican) in the 38th and 39th session. In the 39th New York State Legislature (July 1, 1815 – June 30, 1816) the legislature, by vote, confirmed his election on January 31, 1816 due to 49 contested votes for Henry Fellows, therefore giving Peter Allen a 19-vote majority.