In 1934, the Infantry School (via one COL George C. Marshall) published what amounted to an anthology of small unit tactics from WWI - (some US, some allied, some enemy). The work was updated in 1938 by two of the editors (Harding and Lanham) who worked closely with Marshall on the first edition.

In four parts from CGSC-CSI (many other interesting titles - freebies - also here):

1939 Infantry in Battle 01.pdf

1939 Infantry in Battle 02.pdf

1939 Infantry in Battle 03.pdf

1939 Infantry in Battle 04.pdf

Total over 400 pages (well mapped)

The philosophy is summed from from the gitgo:

1938 Infantry in Battle - No Rules.jpg

IMO: That philosophy seems very relevant today to "COIN" situations and their comparisons - especially to the political side of the military-political equation.

Cheers

Mike