Eddie Willner is a German Jewish teenager raised in a comfortable, assimilated middle-class family. After the Nazi regime strips his family of their rights and forces them into the Auschwitz and Blechhammer labor camps, Eddie must mature rapidly to survive. He relies heavily on the strict physical and mental discipline instilled by his father. Small for his age but observant, he learns to hide his fear and mimic adult strength to pass daily inspections.

Elmer Leroy Hovland is a tank operative who rises to command D Company in the US 3rd Armored Division. Raised by Norwegian immigrant parents on the wind-swept plains of Minnesota, he possesses strong mechanical aptitude and deep Lutheran faith. He leads his soldiers with calm, practical authority rather than military bravado, frequently finding innovative tactical solutions in the field. His religious convictions heavily influence his compassionate command decisions.

Maurits "Mike" Swaab is a fifteen-year-old Dutch Jewish orphan forced into the Nazi labor camp system. Relying on his street smarts, he navigates the brutal camp hierarchy alongside his new friends. He works grueling shifts at a boot factory and later in the synthetic oil refineries. His partnership with Eddie provides both boys with the emotional fortitude needed to endure extreme starvation and physical abuse.

Louis DeCola, nicknamed "Pepsi," is the mess sergeant for D Company, hailing from a large Italian Catholic family in Waltham, Massachusetts. Growing up working in his father's diner, he translates his civilian culinary skills to the battlefield, providing hot meals and emotional comfort to exhausted soldiers. When the unit rescues two starving camp survivors, Pepsi takes charge of their physical rehabilitation.

First Lieutenant Charles E. Myers is a platoon leader in D Company and a former star athlete from Gettysburg College. Handsome and fearless, he leads from the front, frequently volunteering to scout ahead of the armored column. His strong instincts and proactive combat style save the unit repeatedly, making him highly respected among the enlisted men.

SS officer Kurt Klipp serves as the deputy and later commandant of the Blechhammer subcamp. He represents the cold, bureaucratic machinery of the Nazi forced labor system, enforcing policies of starvation and extermination through labor. As the Allied forces close in, he orchestrates the brutal forced evacuation marches westward.

Nicknamed "Tom Mix" by the inmates, this SS guard (believed to be Hermann Leinkenjost) is the most feared man at the Blechhammer subcamp. He kills prisoners on a whim and frequently inflicts punitive "sport" tortures on the exhausted laborers, reacting with heightened sadism whenever Allied bombers strike the synthetic fuel refineries.

James Vance is a young, shy farm boy from Mississippi who serves as a Sherman tank gunner in D Company. Despite his quiet demeanor, he proves to be an exceptionally skilled marksman in armored combat. During the Battle of the Bulge, his rapid reflexes and accuracy play a crucial role in defending a junction against elite German Panzer units.

Fred Headrick is a tank operative from Tennessee who previously worked in a hosiery mill. Serving under Lieutenant Myers, he is an observant and reliable crewman who experiences the entirety of D Company's European campaign. He deeply values the unit's camaraderie and meticulously documents their movements and actions.

Karl Demerer is a Jewish camp elder (Judenältester) appointed by the SS at the Blechhammer subcamp. Positioned dangerously between the Nazi administration and the inmates, he uses his authority to quietly mediate and protect prisoners when possible. He employs coded Yiddish to pass life-saving instructions to new arrivals right in front of the guards.

Siegfried Willner is Eddie's father, a decorated World War I veteran who earned the Iron Cross fighting for Germany. As the Nazi regime targets his family, Siegfried relies on his military background, teaching Eddie how to maintain composure, stand at attention, and absorb physical beatings without flinching. Inside the camps, he acts as a stabilizing force and surrogate parent to other young prisoners.

Auguste Willner is Eddie's mother, described as a soulful beauty and a talented pianist who frequently hosted mixed gatherings of Jewish and Christian friends before the war. When the family goes into hiding in the French vineyards, she plays small piano concerts for the sympathetic villagers in gratitude for their protection.

Nina Willner is a former US Army intelligence officer and the author of the narrative. Using her military research background, she curates survivor testimony and military archives to track the movements of the 3rd Armored Division and reconstruct the circumstances that led to her father's survival.

Captain McDowell is the official commander of D Company as they advance into European combat. He proves highly unreliable under fire, frequently avoiding the front lines and retreating into alcohol use during critical tactical moments, which forces junior officers to shoulder the actual command responsibilities.

Nicassio DeCola is Pepsi's father, an Italian immigrant pursuing the American dream through his family diner. Devastated by the sudden loss of his wife, he throws himself into his business and pulls his rebellious teenage son into grueling restaurant work, inadvertently teaching him the cooking skills that will later save lives.

Fritz is a Catholic neighbor and close friend to the Willner family in Germany. As state-sponsored hatred causes other non-Jewish acquaintances to distance themselves, Fritz remains loyal, bravely agreeing to hide the Willners' family heirlooms and prayer books from the Gestapo.

Harriet is affectionately described by Elmer as a "fancy thing from the city." She marries Elmer shortly before he ships out to Europe, maintaining a connection to him through continuous letters that anchor his faith and resolve on the battlefield.