126th Machine Gun Battalion. WW1

Question

I am looking for more information on the 126th Machine Gun Battalion in WW1. 
 Relative fought for them - Paul J. Pszenitski and interested in finding more information 
 on the unit he served on.

Textual Reference Branch, Archives II · Answer

Dawn Christenson 
 Thank you for posting your question on History Hub! 
 We searched the National Archives Catalog and located the series titled Records of Machine Gun Battalions, 1917 - 1920 (NM-91 1256) within the Records of the American Expeditionary Forces (World War I) (Record Group 120) that include the records of the 126th Machine Gun Battalion in boxes 257-258. For more information about these non-digitized records, please contact the National Archives at College Park - Textual Reference (RR2R) via email at archives2reference@nara.gov . 
 We invite you to continue the conversation with community members on History Hub, but should you have follow up questions for the staff at Archives II, please email us at archives2reference@nara.gov so that we can assist you further. 
 We hope this assists you with your research! 
 Sincerely, 
 Textual Reference Archives II Branch (RR2RR) 
 [RR2RR 24-00361-VVT]

Donald Hall · Answer

I assume you know that the 126th Machine Gun Battalion was part of the 34th Division. 
 The Army Center of Military History has several publications on World War I that may be of interest to you. 
 See page 205 on in the World War I Order of Battle Volume II, here: 
 https://history.army.mil/html/books/023/23-2/CMH_Pub_23-2.pdf 
 It appears they didn't do very much. They arrived in France on 24 October 1918 (the war, of course, ended on 11 November 1918), and was stripped to be used as replacements.