Merrilee - Just found this website, so am a year late in responding.   https://virginiahistory.org/learn/moshers-memoir-wwi-virginia-soldiers-point-view is an exhibit of archival material from someone who served with Co. B, First Battalion, 602nd Engineers.  They have his diary and postcards that he sent home from the front. 2nd Battalion, 310th Engineers also served in France (1st Battalion was sent to Russia), but I can't find anything about a connection between the two regiments. The 310th supposedly had a unit history written at the end of the war, but the only items I can find are about the Russian Expedition.  There is also a two volume collection of photos called Forward March!: The Photographic Record of America in the World War and the Post War Social Upheaval (Frank J. Mackey and Marcus Wilson Jernegan, Ph.D., Advisory Editor), published by The Disabled American Veterans of the World War, Department of Rehabilitation, Chicago, in 1934/39, that has images of the engineers in action in France.

Let me know if you find the connection - my granddad was in the 310th.

Angus, I had not seen your helpful reply until today.  

I did find the diary you mention and I was able to purchase it (a scanned copy). Although my GF was in Company A, I am sure they experienced the same things. The diary even mentions when two in Company A were killed one night at the start of the Muese-Argonne campaign.  I was fortunate to travel for two weeks touring the battlefields in France and the diary was invaluable in retracing the Engineers steps. 

As to the connection between the 310 2 Bn and the 602 1st Bn - I believe they were under one C. O. and all served the Fifth Corp. the 602 was recruited from across the country and trained at Camp Devens in MA. Perhaps they were raised to supplement the 310th? I have a newspaper article that states they are one of the first organizations of Corp Troops at the Camp.  (Boston Post, 24 Mar 1918, pg 14). The article states Corp troops “are the units of the new overseas field army”. 

if you want to learn more about where the 310th/602d operated during the war I found two helpful histories. The first is the Officer Experience Report done by Lt Col. David M. Diller (www.fold3.com/image/272501880) and the second was written by Major Daniel Noce at the Command And General School. It discusses the Road situation faced by the V Corp in the Muese-Argonne Offensive Sept 26-30.  I found it at the Center For Military History (It is titled :  Road situation in the American V Army Corps in the Meuse-Argonne Offensive with particular reference to the work of the 602d Engineers, Sept. 26-30, 1918. )

Hope this is helpful

Angus, I had not seen your helpful reply until today.  

I did find the diary you mention and I was able to purchase it (a scanned copy). Although my GF was in Company A, I am sure they experienced the same things. The diary even mentions when two in Company A were killed one night at the start of the Muese-Argonne campaign.  I was fortunate to travel for two weeks touring the battlefields in France and the diary was invaluable in retracing the Engineers steps. 

As to the connection between the 310 2 Bn and the 602 1st Bn - I believe they were under one C. O. and all served the Fifth Corp. the 602 was recruited from across the country and trained at Camp Devens in MA. Perhaps they were raised to supplement the 310th? I have a newspaper article that states they are one of the first organizations of Corp Troops at the Camp.  (Boston Post, 24 Mar 1918, pg 14). The article states Corp troops “are the units of the new overseas field army”. 

if you want to learn more about where the 310th/602d operated during the war I found two helpful histories. The first is the Officer Experience Report done by Lt Col. David M. Diller (www.fold3.com/image/272501880) and the second was written by Major Daniel Noce at the Command And General School. It discusses the Road situation faced by the V Corp in the Muese-Argonne Offensive Sept 26-30.  I found it at the Center For Military History (It is titled :  Road situation in the American V Army Corps in the Meuse-Argonne Offensive with particular reference to the work of the 602d Engineers, Sept. 26-30, 1918. )

Hope this is helpful