If You Survive by George Wilson
Beyond Band of Brothers by Dick Winters
Doing Battle by Paul Fussell (the first part)
Company Commander by Charles B. McDonald
all of the above by U.S. WWII small unit commanders.

In Deadly Combat by Gottlieb H. Bidermann
he started as a landser in the beginning of the war, was promoted to Lt. and finished up in Courland.

With the Old Breed by E.B. Sledger
The Forgotten Soldier by Guy Sajer
both superb and a view of what good officers look like when viewed from below.

There is another one, very good, by a British platoon commander who fought in Abyssinia (and was captured by the Italians there) and Italy. I forgot the name and will keep searching. David, do know this one?