[15]: Act of March 16, 1802 (Military Laws, pp. 141-149).
[16]: Act of April 12, 1808 (Military Laws, pp. 200-203).
[17]: Acts of January 11, April 23, and June 26, 1812 (Military Laws, pp. 212-215, 222-223, 230).
[18]: Act of January 1813 (Military Laws, pp. 238-240). There is some confusion as to just how many infantry regiments were organized and actually came into being. The Act of January 29, 1813, authorized the President to raise such regiments of infantry as he should see fit, "not exceeding twenty." It seems that 19 were actually formed, made up partly of 1-year men and partly of 5-year men. There are 46 regiments listed in the Army Register for January 1, 1815, and it is known that several volunteer regiments were designated as units of the Regular Establishment and that a 47th and a 48th were redesignated as lower numbered units when several regiments were consolidated because of low recruitment rate. Mahon (in "History of the Organization of the United States Infantry") is not clear on this point. There is an organizational chart of the Army for this period in the files of the Office of the Chief of Military History, Department of the Army.
[19]: Act of February 10, 1814 (Military Laws, pp. 251-252).
[20]: Act of March 30, 1814 (Military Laws, pp. 252-255); Jones, p. 58; "History of the Organization of the United States Cavalry."
[21]: Act of March 3, 1815 (Military Laws, pp. 266-267).
[22]: The reorganization of 1815 is treated by Mahon "History of the Organization of the United States Infantry" (pp. 11-12), Jones "History of the Organization of the United States Field Artillery" (pp. 59-60), and Wike, unpublished study.
[23]: Act of March 2, 1821 (Military Laws, pp. 303-309).
[24]: Acts of April 5 and June 15, 1832 (Military Laws, pp. 322-323, 325-326).