After yet another deadly battle, Blutch and Chesterfield's Union army finds itself without a hospital. The soldiers' only chance at survival arrives in the form of unexpected help: Mary Edwards Walker, a qualified and experienced doctor who, to the shock of the troops, happens to be a woman! They are about to lock horns with an abrasive, bold force who scorns their smoking and drinking, and has little respect for the military discipline … of either army! ...

After yet another bloody battle, the Union Army organises a recruiting drive during which Blutch attempts to dissuade an obviously too young boy from signing up. To no avail, though, and before long the kid, Pucky, joins them as … a drummer boy! While Chesterfield is tasked with looking after him, Pucky begins to practice his drumming – much to the displeasure of the troops, who are eager to get some rest before the major engagement looming on the horizon.

The Civil War rages on. Despite some much-needed victories, losses have been harrowing on the Union side, and volunteers are getting scarce. That leaves conscription, but it’s an extremely unpopular measure – especially because of the possibility to avoid it by paying a sum of money only the rich can afford. Yet the North has little choice but to maintain it … and this is how, in July 1863 in New York City, simmering resentment turns into bloody rioting – with Blutch and Chesterfield caugh...

A quiet day in the Union Army … Soldiers are resting, Blutch and Chesterfield are arguing, and the generals are plotting strategy. Things change suddenly with the arrival of a new regiment, sent as reinforcements to counter the imminent arrival of the Confederates. With them is a young dog, Sallie, who’s been on every battlefield with her uniformed masters, and who takes an immediate liking to Chesterfield, to the point that she accompanies him on a dangerous scouting mission …

Two companies are competing to build the intercontinental railway. When one sends saboteurs to intercept the powder needed to pierce tunnels through the mountains, the other calls upon Lucky Luke to protect a last chance convoy. The problem is, it’s not powder that gets loaded onto the train this time – it’s nitroglycerin! And as if that wasn’t enough, the saboteurs are still around ... and the Daltons are convinced the train is full of gold!

A new recruit makes the mistake of asking Blutch to tell him about the infamous battle of Bull Run … in public! The hostility of the other Union soldiers is immediate, yet Blutch eventually explains the reason for it. That battle, the first major one of the war, which had seemed to the North like such an inevitable victory that masses of civilians had gone to watch it as spectators, ended in a complete rout. And Blutch and Chesterfield were there …

General Alexander’s Union army is out of horses, and it is now facing none other than Robert E. Lee himself. To rebuild the Northern Cavalry before the coming battle, Blutch and Chesterfield are sent to buy new mounts, with the help of legendary horse trainer Ben “Bronco Benny” Wilcox. But, first, they'll have to cross Rebel lines, face angry Indians, and deal with Benny’s fascination with a very special horse named “Traveller”...

While out on patrol, Blutch and Chesterfield encounter an unusual soldier: a woman wearing a Union uniform, who has come to join the army to look for her brother and uphold the family’s honour. Blutch is unconvinced, but the sergeant, won over by the combination of bravery and a pretty face, agrees to help her. That, however, means taking her along for Captain Stark’s demented charges – a prospect that could drive anyone to shirk their duty or desert…

War rages on, and the wounded pile up – including Blutch, courtesy of Confederate artillery. The Union Army doctors are swamped. In order to address his shortage of healers, General Alexander brings in a quartet of female nurses. But while he did also recruit a foul- tempered ‘matron’ of sorts to discourage anyone more interested in flirting than doing their duty, he may not have planned for the possibility of one of the nurses falling for a certain small, unruly, bald corporal …

After a series of bloody battles, the 22nd Cavalry is once again depleted. Sent on a recruiting drive, Chesterfield meets only failure – between the reputation of their unit and Blutch’s constant sabotage efforts, finding volunteers is almost impossible. Until fate brings them to a penitentiary where some very unsavoury characters are about to hang. Offered a choice, the criminals will pick the uniform over the noose, but can they be controlled?

Stark’s constant, reckless charging has once again depleted the 22nd Cavalry. Faced with an understandable dearth of volunteers, the Army’s brass drafts – without telling them – some freshly arrived immigrants. And Blutch and Chesterfield are tasked with instructing them in the art of riding down the enemy. But there’s a problem: the new recruits only speak Russian! And while those Cossacks are already fantastic riders, they have no desire to die for the glory of the Union...

After another long day of charging, Blutch and Chesterfield make the acquaintance of Matthew Brady, a professional photographer dispatched by President Lincoln to document the ongoing historic struggle. Photography, still a new invention, together with Brady’s talent for capturing the moment, are met with great enthusiasm by both the rank and file and the top brass. Inevitably, it’s not long before Blutch and Chesterfield are ordered to act as the artist’s protective detail – much to the s...