I only saw nine books in the series printed. The first two were printed by Zebra books, the rest by Bantam books. Some titles are:

#4 The Liberation of Paris.
#5 Doom River (about the crossing of the Mosell, and the attack on Metz).

#8 Bastogne (about the Battle of the Bulge).
#9 Hammerhead (takes place after the BoB). Its also the last one in the series I have ever seen.

Here is an exerpt from Doom River:

"FOLLOW ME!"

Mahoney slipped once and fell into the river. After swallowing some water, he regained his balance, holding up his carbine with both hands, sloshing toward shore. Bullets whistled over his head and he heard a screm to his left and a groan to his right. The water level was down to his chest nowand his legs pumped like pistons as he hurried toward the riverbank. "Lets go!" he yelled. "Hit the beach!"

At that moment he didn't look to his left or right to see where anybody was. He didn't give a damn about anything except saving his own worthless butt. The water was now down to his waist. Still fighting the current, he charged toward the beach. He saw flashes of light ahead and made a mental note of their location because that's where he intended to start firing as soon as he could.

Knees clear of the water, he raced through the shallows to the riverbank. Tripping over a stone, he pitched forward onto his knees, but he got up quickly and kept running. "Kill the bastards!" he screamed. "Charge!"

Needless to say, there are my favorite of all fictional books.