CACrown ArchivesThe cinema collection
Menu
Research dossier · General Reference

9th Engineer Battalion (United States)

military unit

Cross-disciplinary reference desk with index cards, atlas, dictionary and catalogue
General referenceInterpretive dossier study · Crown Archives visual atlas
Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionMay 13, 2026
Entity authorityQ275713 ↗
Source-derived summary

The 9th Engineer Battalion is a unit of the United States Army that deploys to designated contingency areas and conducts combat and/or stability operations in support of a brigade combat team. It is a divisional mechanized combat engineer unit, composed of three line companies and a headquarters company. Its mission is to provide assured mobility, counter-mobility, general engineering, and survivability support, with well trained sappers (combat engineers) ready to deploy anywhere at any time. The unit's history spans service in 1917 in the US southwest, World War II in France and Germany, multiple deployments to the Balkans, and multiple deployments in support of the global war on terrorism in Iraq and Afghanistan. It is most famous for the capture of the Ludendorff Bridge across the Rhine River. As of 18 May 2015, the battalion exists as the 9th Brigade Engineer Battalion (9th BEB) in Fort Stewart, GA under 2nd Armored Brigade Combat Team, 3rd Infantry Division.

Unit insignia

The crest was approved by the Department of the Army and the 9th Engineer Battalion on 27 July 1967. All the symbols reflect the battalion's initial service in the southwest United States. The wreath under the Gila monster is the Corps of Engineer wreath. The Gila monster represents service along the Gila River and the southwest desert from 1917 to 1920 (added to the insignia in 1925).

Editorial summary

This brief starts where responsible research should: with the source description of “9th Engineer Battalion (United States)” as military unit. Everything that follows is an evidence route, not borrowed authority.

Editorial reviewA concise reference frame for defining the subject, testing terminology and identifying the institution closest to the evidence. The current lead gives the account dated anchors—1917, 2015, 1967, 1920—that can be checked directly. The linked authority record independently contributes the date 1917. The account is most persuasive where Engineer, Battalion and United can be independently traced.
Editorial analysis

Why this record matters

The subject matters to the general reference register because the source frames it as military unit. Its deeper value depends on whether names, dates, institutions and citations support that framing.

Evidence profile

The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated May 13, 2026. The linked authority identifier is Q275713. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1917, 2015, 1967 and 1920.

Critical limits

The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

Best used for
  • Subject orientation
  • Search vocabulary
  • Locating named sources
Verify next

The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “9th Engineer Battalion (United States)”, its source revision and the description used here.
  2. Expand the search: follow 9th Engineer Battalion (United States) primary sources, 9th Engineer Battalion (United States) archive and Engineer research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “9th Engineer Battalion (United States)”?
  2. Which institution is responsible for the underlying evidence?
  3. Which cited source is closest to the event, object or claim?
Subject index

Search terms from this dossier

Source & attribution

This entry incorporates text from “9th Engineer Battalion (United States)” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.