Grenadiers
the story of Kurt "Panzer" Meyer
Quick overview:
one of if not the youngest divisional commanders of WW2
It starts off with the invasion of Poland, then leads you through the Balkans and Greece( it was here that his Grenadiers were pinned down whilst assaulting a heavily defended mountain to get the advance going again he cooly pulled out the pin of a grenade and lobbed it just behind his own men he managed to keep the attack going and the Kleisoura pass was taken.) , to the Eastern Front then eventually Normandy where he got his divisional command the 12th SS Panzer division Hitlerjugend but that achievement was overshadowed by the execution of Canadian and British soldiers. Although im not sure if he himself ordered the massacre (i dont think he did but i havent read the whole book yet.)
some fiction as well
Simon Scarrows '
If memory serves me right, this series follows 2 Romans Macro and Cato who travel throughout the Roman Empire. Cato comes as a new recruit and is met by Macro a Veteran Centurion they immediately start off on the wrong foot with Macro feeling Cato is not up to being a legionnaire never mind a Centurion. Which he has been assigned to by Imperial decree (due to the fact he used to work in the imperial palace.) He is put in second command an Optio(i think) but through perseverance and bravery on the battlefield, Cato eventually proves to Macro that he is worthy of his position. Macro eventually comes to respect Cato they then become bvery good friends with almost a farther/son relationship.
there are 9 books in this series all very good reads. There's many dangers/obstacles that they have to overcome such as Brutal street fights to Political enemies scheming against the empire. He really engages the reader and you start to care about the fate of the characters which makes you wanting to start on the next book as soon as you've finished the first one.