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The story
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Marvin spends the night helping build the fort while complaining about blisters and discovering that war includes far more digging than he expected. Caesar Bason introduces him to Peter Salem, another Black soldier. Marvin asks how they can fight for a country that still enslaves people like them. Peter answers that no one is truly free until everyone is free. Even if the new nation takes generations to fulfill its promise, he believes defending liberty now can begin something that may one day spread freedom much farther.
At sunrise, British ships spot the fort and begin firing from the bay. Captain Smith first orders Caesar to escort Marvin away, but British troops land before they can leave. The exhausted men who have worked all night must defend the position because their promised reinforcements have not arrived. William has not returned from his search for food, so Caesar volunteers Marvin to serve as the drummer.
Colonel Prescott prays with the soldiers, asking God to keep them from trusting only in human strength. Marvin knows only a few drum calls and is frightened by the responsibility, but Caesar tells him that he is both able and needed. When the British move within range, Marvin sounds the call to arms and then helps load muskets.
The defenders have very little ammunition, so Prescott orders them to wait until the attackers are close. Marvin looks along the line and sees Black and white soldiers standing together. Caesar and Peter remain on either side of him. Caesar reminds him that this is not merely a white struggle but a struggle for freedom shared by them all.
During the first attack, a Black soldier from another regiment fires with remarkable skill. He brings down a British officer identified as Lieutenant Colonel Abercrombie and continues fighting even after much of his regiment is gone. The British retreat, and Marvin begins to hope the fort can be held.
The British return without their heavy packs and charge faster with bayonets. The defenders’ ammunition runs so low that Marvin gathers nails, rocks, and anything else that might be used. Major Pitcairn reaches the fort and demands surrender, but Peter Salem shoots him. The British attack again before the Americans can recover, and Captain Smith orders a retreat toward Charlestown Neck.
Caesar asks for the remaining ammunition and stays behind to protect the departing soldiers. Marvin refuses to abandon him after Caesar is wounded in the leg and struggles to carry him away. Captain Smith finds them, helps defend the retreat, and eventually lifts Caesar onto his back. The approaching British remain too close, and Caesar insists that the captain put him down rather than sacrifice both himself and Marvin.
Marvin does not want to leave, but Caesar freely accepts the cost of protecting them. He tells Marvin that he is no longer merely the frightened Barrel Boy. Captain Smith leads Marvin away and urges him never to forget the life Caesar has given for his friends and for freedom.
Marvin and the captain find William, who has injured his ankle while escaping the British. When more soldiers approach, the captain draws them away and sends the boys into a barn. William creates a distraction so Marvin can escape through the back, but the door will not open. Before Marvin can learn what happens next, the Imagination Station brings him home. Whit assures him that William outwits the officer and survives.
Marvin is surprised that the Americans lose the Battle of Bunker Hill after all their courage. Whit explains that the victory costs the British about a thousand men, roughly twice the American loss, and strengthens the colonial cause even in defeat. Marvin’s more important question is whether Black Americans truly performed the deeds he witnessed or whether the adventure added them to make history seem fairer.
Whit returns to the paintings they examined earlier. This time Marvin looks carefully enough to see Prince Whipple near the front of Washington’s boat as it crosses the Delaware. In the Bunker Hill painting, he sees Black soldiers fighting beside white ones and recognizes the unknown marksman from the battle. Whit identifies that soldier as Salem Poor.
Whit also shows Marvin a commendation signed by fourteen white officers who witnessed Salem Poor’s courage and skill. The document confirms that the Black soldier distinguished himself as an experienced officer and an excellent fighter. Marvin finally sees that African-American service was present in the images all along, even though he had not known where to look.
The assignment that once seemed unrelated to Marvin’s heritage now opens a much larger history. He is ready to prepare his speech and eager to learn more. Because the new Imagination Station program is unfinished, Whit will not send him back yet, but he invites Marvin to help scan the research. Marvin pretends reluctance, then gladly joins the work.

