133d Engineer Battalion
(Twentieth Maine)

• Constituted 21 June 1760 in the Massachusetts Militia as the Cumberland Regiment
• Elements called into active service at various times during the Revolutionary War and additionally formed Phinney’s Regiment, authorized 23 April 1775 in the Massachusetts State Troops; organized in the spring of 1775 in Cumberland County to consist of ten companies from Cumberland County; adopted 14 June 1775 into the Continental Army and assigned to the Main Army; assigned 22 July 1775 to Heath's Brigade, an element of the Main Army; consolidated 1January 1776 with Scammon's Regiment (authorized 23 April 1775) and Watkins' Company, Paterson's Regiment (organized in 1775 in Berkshire and Cumberland Counties) , and consolidated unit redesignated as the 18th Continental Regiment, an element of Heath's Brigade, to consist of eight companies; relieved 4 April 1776 from Heath's Brigade and assigned to the Eastern Department; relieved 3 August 1776 from the Eastern Department and assigned to the Northern Department; assigned 4 September 1776 to Paterson's Brigade, an element of the Northern Department; relieved 18 November 1776 from Paterson's Brigade; reorganized and redesignated (less two companies) 1 January 1777 as Samuel Brewer's Regiment , an element of the Northern Department, to consist of eight companies; (two companies concurrently consolidated with the 15th Continental Regiment – hereafter a separate lineage); assigned 13 August 1777 to the 3d Massachusetts Brigade, an element of the Northern Department; (3d Massachusetts Brigade relieved 27 October 1777 from the Northern Department and assigned to the Main Army; relieved 20 November 1778 from the Main Army and assigned to the Highlands Department); reorganized 12 May 1779 to consist of nine companies; redesignated 1 August 1779 as the 12th Massachusetts Regiment; relieved 14 November 1779 from the 3d Massachusetts Brigade and assigned to the 1st Massachusetts Brigade, an element of the Highlands Department; disbanded 1 January 1781 at West Point, New York
• Reorganized and redesignated 8 February 1776 as the Cumberland Brigade
• Mustered into state service 1 July 1779; mustered out of state service 25 September 1779
• Reorganized and redesignated in 1787 as the 1st Regiment, 2d Brigade, 6th Division
• Reorganized 26 June 1804 as separate standing companies attached to the 1st Regiment, 2d Brigade, 6th Division
• Reorganized and redesignated 10 May 1809 as the 6th Regiment, 2d Brigade, 6th Division
• Reorganized and redesignated 12 May 1812 as the 3d Regiment, 2d Brigade, 12th Division
• Mustered into Federal service 17 September 1813; mustered out of Federal service 6 December 1813
• Mustered into Federal service 7 September 1814; mustered out of Federal service 19 September 1814
• Mustered into Federal service 26 September 1814; mustered out of Federal service 27 October 1814
• (District of Maine reorganized 15 March 1820 as the State of Maine)
• Reorganized and redesignated in June 1820 as the 3d Regiment, 2d Brigade, 5th Division
• Reorganized and redesignated 21 June 1854 as the 1st Regiment of Light Infantry
• Mustered into Federal service 3 May 1861 at Portland as the 1st Infantry Regiment, Maine Volunteers; mustered out of Federal service 5 August 1861 at Portland
• Reorganized 28 September 1861 as the 10th Maine Volunteer Infantry Regiment
• Mustered into Federal service 3 October 1861 at Cape Elizabeth
• Reorganized and redesignated 26 April 1863 as the 10th Maine Battalion
• Consolidated 1 November 1863 with the 29th Infantry Regiment, Maine Volunteers (organized 30 September 1863 at Augusta), and consolidated unit designated as the 29th Infantry Regiment, Maine Volunteers
• Mustered into Federal service 17 December 1863 at Augusta; mustered out of Federal service 21 June 1866 at Hilton Head, South Carolina
• Reorganized 1868-1871 in the Maine Volunteer Militia as separate companies of Infantry
• Former 1st Infantry Regiment reorganized 5 April 1873 in the Maine Volunteer Militia from existing companies with Headquarters at Portland
• Reorganized 16 June 1880 to consist of companies from the western portion of the state
• (Maine Volunteer Militia redesignated 28 March 1893 as the Maine National Guard)
• Mustered into Federal service 10-26 May 1898 at Augusta as the 1st Maine Volunteer Infantry; mustered out of Federal service 25 October-13 December 1898 and resumed state status as the 1st Infantry Regiment
• Regiment broken up 1 January 1910 and reorganized as the 1st through 12th Companies, Coast Artillery Corps (13th Company organized in 1916)
• Called into Federal service 25 July 1917; drafted into Federal service 5 August 1917
• Reorganized and redesignated 23 August 1917 as numbered companies in the Coast Defenses of Portland
• Reorganized and redesignated (less former 1st, 6th, 10th, and 12th Companies) 25 December 1917 as elements of the 54th Artillery (Coast Artillery Corps) (former remaining companies continued as elements of the Coast Defenses of Portland)
• 54th Artillery (Coast Artillery Corps) demobilized 13 March 1919 at Camp Devens, Massachusetts; remaining companies demobilized December 1918-January 1919 in the Coast Defenses of Portland
• Former Coast Artillery Corps, Maine National Guard, reorganized 11 July 1922 as the 1st Coast Defense Command, Coast Artillery Corps, with Headquarters at Portland
• Reorganized and redesignated 17 September 1923 as the 240th Artillery (Coast Artillery Corps) with Headquarters at Portland
• Redesignated 16 April 1924 as the 240th Coast Artillery
• Inducted into Federal service 16 September 1940 at home stations
• Regiment broken up 7 October 1944 and its elements reorganized and redesignated as follows:
• Regiment (less 2d and 3d Battalions) as the 185th Coast Artillery Battalion
• 2d Battalion as the 186th Coast Artillery Battalion
• (3d Battalion disbanded)
• After 7 October 1944 the above units underwent changes as follows:
• 185th Coast Artillery Battalion (less Batteries A, D, and E) inactivated 1 April 1945 at Peaks Island (Batteries A, D, and E inactivated 20 June 1946 as elements of the Harbor Defenses of Portland)
• 186th Coast Artillery Battalion (less Batteries A, B, and E) inactivated 1 April 1945 on the eastern seaboard of the United States (Batteries A, B, and E inactivated 30 June 1946 as elements of the Harbor Defenses of Portland)
• Former 185th and 186th Coast Artillery Battalions consolidated 6 February 1947 and consolidated unit reorganized and Federally recognized in the Maine National Guard as the 703d Antiaircraft Artillery Gun Battalion with Headquarters at South Portland
• 703d Antiaircraft Artillery Gun Battalion ordered into active Federal service 14 August 1950 at home stations; released from active Federal service 13 April 1952 and reverted to state control
• Redesignated 1 October 1953 as the 703d Antiaircraft Artillery Battalion
• Battalion broken up 1 March 1959 and its elements reorganized and redesignated as follows:
• Battalion (less Headquarters and Battery D) consolidated with the 103d Infantry (see ANNEX 1) to form the 103d Armored Cavalry
• Headquarters and Battery D, 703d Antiaircraft Artillery Battalion, consolidated with the 314th Antiaircraft Artillery Battalion (see ANNEX 2) to form the 240th Artillery, a parent regiment under the Combat Arms Regimental System, to consist of the 1st Automatic Weapons Battalion
  After 1 March 1959 the above units underwent changes as follows:
  103d Armored Cavalry (less Headquarters Troop and Aviation Company) reorganized and redesignated 1 June 1961 as the 20th Armor, a parent regiment under the Combat Arms Regimental System, to consist of the 1st, 2d, and 3d Medium Tank Battalions; Headquarters Troop concurrently reorganized and redesignated as Headquarters and Headquarters Company, 133d Armor Group (Aviation Company, reorganized and redesignated as the 112th Aviation Company-hereafter separate lineage)
  (2d Medium Tank Battalion, 20th Armor, ordered into active Federal service
  15 October 1961 at Lewiston; released from active Federal service 9 August 1962 and reverted to state control)
  20th Armor reorganized 1 March 1964 to consist of the 1st, 2d, 3d, and 4th Battalions
  Consolidated (less 3d Battalion) 31 December 1967 with Headquarters and Headquarters Company, 133d Armor Group (see above), and consolidated unit converted, reorganized, and redesignated as the 133d Engineer Battalion with Headquarters at Portland (3d Battalion, 20th Armor, concurrently broken up and its elements reorganized and redesignated as various units in the Maine Army National Guard—hereafter separate lineages)
  240th Artillery converted, reorganized, and redesignated 1 June 1961 as the 262d Engineer Battalion with Headquarters at Bangor
• 133d and 262d Engineer Battalions consolidated 1 September 1993 and consolidated unit designated as the 133d Engineer Battalion with Headquarters at South Portland
• Ordered into active Federal service 7 December 2003 at home stations; released from active Federal service 3 June 2005 and reverted to state control
• Reorganized 1 September 2008 to consist of the Headquarters Company and the Support Company and (Companies A, B, and C concurrently reorganized and redesignated as various units in the Maine Army National Guard—hereafter separate lineages); concurrently, location of Headquarters changed to Gardiner
• Ordered into active Federal service 10 August 2013 at home stations
• ANNEX 1
• Constituted 25 April 1861 in the Maine Volunteer Militia as the 2d Infantry Regiment
• Organized 2 May 1861 at Bangor from new and existing units in Bangor and surrounding communities
• Mustered into Federal service 28 May 1861 at Willett’s Point, New York, as the 2d Infantry Regiment, Maine Volunteers; mustered out of Federal service 9 June 1863 at Bangor (less personnel transferred to the 20th Maine Infantry Regiment, Maine Volunteers—see ANNEX 3)
• Reorganized 1868-1871 in the Maine Volunteer Militia as separate companies of Infantry
• Former 2d Infantry Regiment reorganized 16 June 1880 in the Maine Volunteer Militia from new and existing units in the eastern portion of the state
• (Maine Volunteer Militia redesignated 28 March 1893 as the Maine National Guard)
• (While remaining in state service during the War with Spain, the 2d Infantry Regiment furnished personnel for the 1st Battalion, Maine Volunteer Heavy Artillery)
• Mustered into Federal service 28 June 1916 at Augusta; mustered out of Federal service 25 October 1916 at Augusta
• Called into Federal service 13-30 April 1917 at home stations; drafted into Federal service 5 August 1917
• Reorganized and redesignated 21 August 1917 as the 103d Infantry and assigned to the 26th Division
• Demobilized 28 April 1919 at Camp Devens, Massachusetts
• Consolidated 1 January 1922 with the 3d Infantry, Maine National Guard (see ANNEX 4) and consolidated unit reorganized and redesignated as the 103d Infantry; concurrently assigned to the 43d Division with Headquarters at Portland
• Inducted into Federal service 24 February 1941 at home stations
• (Headquarters, 43d Division redesignated 19 February 1942 as Headquarters, 43d Infantry Division)
• Inactivated 1 November 1945 at Camp Stoneman, California
• Relieved 21 May 1946 from assignment to the 43d Infantry Division
• Reorganized and Federally recognized 21 October 1946 in the Maine National Guard in southwestern Maine as the 103d Infantry with Headquarters at Portland
• ANNEX 2
• Organized and Federally recognized 3 April 1929 in the Maine National Guard as the 2d Battalion, 152d Field Artillery, an element of the 43d Division, with Headquarters at Bangor
• Inducted into Federal service 24 February 1941 at home stations
• Reorganized and redesignated 19 February 1942 as the 152d Field Artillery, an element of the 43d Infantry Division
• Inactivated 14 October 1945 at Camp Stoneman, California
• Redesignated 21 May 1946 as the 203d Field Artillery Battalion and relieved from assignment to the 43d Infantry Division
• Consolidated 19 December 1946 with Headquarters and Headquarters Battery, 203d Field Artillery Group (see ANNEX 5) and consolidated unit reorganized and Federally recognized in the Maine National Guard as the 314th Antiaircraft Artillery Automatic Weapons Battalion with Headquarters at Bangor
• Reorganized and redesignated 1 December 1950 as the 314th Antiaircraft Artillery Gun Battalion
• Reorganized and redesignated 1 July 1951 as the 314th Antiaircraft Artillery Automatic Weapons Battalion
• Redesignated 1 October 1953 as the 314th Antiaircraft Artillery Battalion
• ANNEX 3
• Constituted 7 August 1862 in the Maine Volunteer Militia as the 20th Infantry Regiment
• Organized and mustered into Federal service 8-29 August 1862 at Portland as the 20th Infantry Regiment, Maine Volunteers; mustered out of Federal service 16 July 1865 at Washington, D. C.
• Consolidated 5 June 1865 with personnel from the former 16th Infantry Regiment, Maine Volunteers (organized 14 August 1862 at Augusta) and consolidated unit designated as the 20th Infantry Regiment, Maine Volunteers
• Consolidated 21 June 1865 with the 1st Regiment of Sharpshooters, Maine Volunteer Militia (organized 27 October – 29 December 1864 at Augusta) and consolidated unit designated as the 20th Infantry Regiment, Maine Volunteers
• Mustered out of Federal service 16 July 1865 at Washington, D. C.
• ANNEX 4
• Constituted 1 October 1917 in the Maine National Guard as the 3d Infantry
• Organized 19 July 1918 from new and existing companies; Headquarters Federally recognized 15 January 1920 at Portland
• ANNEX 5
• Organized and Federally recognized 2 January 1930 in the Maine National Guard at Bangor as Headquarters Battery, 152d Field Artillery, an element of the 43d Division
• Inducted into Federal service 24 February 1941 at Bangor
• Reorganized and redesignated 19 February 1942 as Headquarters Battery, 203d Field Artillery, and relieved from assignment to the 43d Infantry Division
• Reorganized and redesignated 1 March 1943 as Headquarters and Headquarters Battery, 203d Field Artillery Group
• Inactivated 27 November 1945 at Camp Kilmer, New Jersey

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