While the armies of the Chinese Empire were overwhelmed in Siberia, the situation in the Balkans and the Black Sea had already settled.

On 5 April, British troops landed at Galapoli. This was where the coalition battle plan was born. 60,000 British and French troops landed on the Crimean Peninsula with the cooperation of the navy, and took the Russian naval base Seva Potor Fortress within 6 weeks. This was a limited goal, aimed at eliminating Russia's Black Sea Fleet and ending Russia's superiority in the Black Sea. This was in line with the wishes of England, and for France, the war itself served its purpose. As more troops arrived, the coalition forces began to advance towards Constantinople. Alcohol and women were very cheap in the area, and syphilis was very common among coalition soldiers. The sanitation was terrible, as was the logistics in the UK. Since the Napoleonic Wars, the logistical training of the British army has been abandoned. Most officers had never experienced war, even low-intensity colonial conflicts. The French army was in much better shape. Napoleon was defeated, but France was not defeated. The French Army remains the best-equipped and best-organized army in Europe, with many officers with combat experience and an effective logistical system. In terms of weaponry, the advantages of Britain and France came from the new rifled rifle -- the Mini rifle. The biggest advantage of rifled rifles over smoothbore guns is range and accuracy. The effective range of the smoothbore gun was only 150 yards (about 0.914 meters per yard) and its accuracy was low. And rifled rifles also have an effective range of 500 yards. The French army was the first to be armed with the Mini rifle in the late 1840s, which gave it a huge technical and tactical advantage over the armies of the great powers of the same period. New rifles bring new tactics. The formation of the skirmish line in the Napoleonic era can be further expanded to avoid being killed by the enemy's fire. The opponent's dense formation will be subjected to accurate fire from greater distances. In addition, the role of artillery has changed significantly, since the typical range of field artillery is mostly 1000-1500 yards, and some light artillery even has only 600-800 yards, which has a smaller range advantage over rifles. The role of artillery became similar to that of later machine guns, as a fire multiplier for infantry. Despite the sluggishness of the top brass and distrust of rifled rifles (more believing that Chinese-made rifles were technically mature after all), the British army was equipped with the Type 1851 Mini rifle in 1851, which constituted the main combat individual weapon of the British Army in the Knymian War and played a huge role.

The British, French and Turkish teams get along well in Wana. But health issues are becoming a growing concern. Damp, small insects and schistosomes infest the barracks. The shortcomings of the British logistics organization were very obvious: no one knew where the post office was, where the field hospital was, or even where their generals were. On 19 July, cholera broke out in the French camp. On the 22nd, it spread to the British * battalion. Despite the destruction of all tents, the plague remained uncontrolled. The situation was made worse by a fire on August 10 that destroyed a lot of munitions, including 16,000 pairs of boots and 150 tons of biscuits.

Orders from London and Paris constantly urged the coalition forces to go into action. The coalition forces do not know exactly how many Russian troops there are in Crimea, and estimates range from 45,000 to 140,000, but in fact the Russian army has only 36,000 at this time. On August 24, the coalition forces began to board the ship, and it is planned to complete all boarding tasks on September 2. Among the troops that were able to participate in the operation were 27,000 British, 30,000 French and 7,000 Turkish. On September 7, the commander of the coalition navy, British Admiral Dundas, ordered. St. Arnold set out on the 5th with cholera, and the one-armed Raglan followed the main force. Raglan's flagship, the Karaddock, flew the Russian* flag to reconnoitre, and finally chose Yevpatoria in Kalamita Bay, 35 miles north of Sevaspostol, as the landing site.

On September 12, the coalition fleet reached Yevpatoria. The mayor of Yevpatoria agreed to surrender, but demanded that the coalition forces must be quarantined, given the plague that the coalition forces were carrying. At dawn on September 14, the coalition forces began to land, and the landing went well. Every coalition soldier was heavily loaded, and at 9 a.m. on the 19th, the main force of the coalition army, 55,000 men, set out, and the landing ground was handed over to the Turkish army. However, cholera infected some of the soldiers. At the Balkannek River, the coalition forces encountered an outpost of the Russian army for the first time. The British cavalry demanded pursuit, but Raglan refused, as he found it to be a trap. In the distance of the Russian cavalry there were also 6,000 men of the 17th division of the Russian army. Both sides used artillery to attack each other from a distance, and the British won. The Russians retreated to the main positions in Omar, where they hoped to stop the advance of the coalition forces towards Sevasporol. That night, the Allied forces camped to prepare for the attack on Omar, and the British could only sleep in the cold due to the lack of tents, while the French army was much more comfortable.

On 23 September, the British army marched south in a sunny and windy day, and the troops were allowed to loot along the road, so morale was high. The curse of cholera has now eased a lot. After the British crossed the Pobek River, Sevas Potor was already visible. Raglan decided to continue the advance south as planned, and then attack Sevasporol from the south to the north. When the coalition forces marched from the flanks to bypass Sevasporol, they also lost their advantage in delaying the siege of the city, and Sevasporol had a natural harbor deep inland, which could accommodate a large number of naval ships, and the Russian Black Sea Fleet used this as its home port. Outside the city is a continuous high ground, and there are 13 coastal batteries and 611 artillery pieces on the seaside side of the fortress, which is easy to defend and difficult to attack. The city of Seva Potor in 1854 itself was not yet fully fortified, as the Russian army had never anticipated a defensive battle in the Crimea. The garrison of the fortress, with the participation of the inhabitants, constructed a 7-kilometer-long defensive line consisting of 8 bastions and a large number of intermediate fortifications. Faced with a powerful coalition fleet, Menshikov believed that the Black Sea Fleet had no chance of winning a battle at sea, so he forced Admiral Kornilov to scuttle the fleet and block the shipping lanes. The Russian army sank 5 sail battleships (14 in total) and 2 cruisers (7 in total) in the surface warships at the entrance to the port to prevent the coalition steam warships from breaking into the mooring ground in the harbor, and the rest of the sailing ships and all steamboats and steam cruisers participated in the defense of the city, and about 1,000 naval guns were moved to land one after another, and the naval officers and sailors also went ashore to enrich the garrison of the city. Menshikov led the main Russian forces to the northeast outside the city, hoping to join up with Russian reinforcements and threaten the coalition flank from there. Sir Larcan's light cavalry pursued the Russian army and captured a number of Russian supply wagons before Lord Raglan could call them back.

On the night of 25 September, the British army spread out on the wide front between the Pobek and Chernaya rivers and rested. On the morning of the 26th, the British had a hearty breakfast and then marched south to Balaclava. After a burst of ineffective artillery fire, the British entered the small town of Balaclava. Locals show kindness by bringing out fruits, flowers and bread. A day later, the French followed along the route of the British. By this time Saint-Arnold was no longer in order, and the French army was now under the command of Carlo Porter. On the 29th, Saint-Arnold died. Raglan decided to base the British headquarters at Balaklava, while the French camped in the bays of Kamish and Kazak, west of Balaklava. The French camp was backed by the sea, which made it easy to receive supplies from the sea, while the British had difficulty in supplying and had to face Russian reinforcements directly. Raglan was supposed to be deployed to unite the coalition forces, as he was the only supreme commander at this time. His personality is commendable. Now the coalition forces surrounded Sevas-Potor from three sides, the French in the southwest, and the British in the southeast and east. The coalition fleet cruises the seas.

Raglan advocated an immediate siege, but between 27 September and 10 October he failed to convince Carlo Potter and the engineer commander, Sir Bogne. Bognye insisted that artillery should first weaken the Russian defenses; Carlo Porter, on the other hand, decided it was too risky to attack directly through the open field. By the 10th, the coalition forces decided to formally lay siege to Sevasporol. These days, the fortifications of the Russian army in Sevaspor are strengthening day by day. In addition, Russian reinforcements from Odessa and elsewhere were arriving. On 9 October, 28,000 reinforcements entered Sevas Potor, bringing the number of defenders to 38,000. By the second week of October, the Russian army had returned to its pre-Arma strength, or even stronger. The coalition forces hoped that the artillery bombardment would completely destroy the Russian fortifications, and after difficult transportation, heavy artillery and siege equipment were transported to the high ground outside the city, and civilian houses were demolished to reinforce the heavy artillery positions. The artillery of the Russian army in Sevasporol increased from 172 to 341, and some of them were naval guns removed from warships. The French had 53 guns, the British 73. The French concentrated 49 guns on the hill of Rhodofe, which was facing the central fortress of the Russian army. The coalition navy also planned to take part in the shelling, but it was postponed due to lack of ammunition. Carlo Potter asked the Allied Navy to drop anchor and line up in a line of close shelling, as the navy traditionally shelled while sailing to avoid shore artillery attacks. British Admiral Dundas finally conceded to French Admiral Hamlin and agreed to the plan. On October 17, the artillery bombardment of the coalition navy was carried out for a day, but 1,100 naval guns had little effect. On the contrary, the Russian artillery fire inflicted heavy damage on the coalition navy. The Royal Navy lost 300 men, 7 warships were seriously damaged, and the French fleet suffered significant losses. Although a French ammunition depot on the hill of Rhodofe was blown into the sky, the Allied land shelling was much better. British shelling reduced the fort to rubble, but the Russians repaired the damaged fortifications that night. This went on for 7 days. The Russian army suffered heavy losses, 2,000 people were killed in the shelling, and on the 17th, Vice Admiral Vladimir Alekseevich Kornilov was killed.

After 11 months of siege, coalition forces finally entered Sevastopol, which was now in ruins. The Russian army was generally successful in the defensive battle of Sevastopol, and it was a model of coordinated operations between the army and navy to defend the coastal fortresses, although it was inferior in terms of the number of troops, artillery and the quality of weapons, the Russian army continued to attack at night and used a large number of mines, and the defense system of the deep echelon configuration caused great damage to the coalition forces. The defenders of Sevastopol were in extreme difficulty with weapons, ammunition and food, and they paid the price of blood for the economic backwardness of Tsarist Russia.

After the fall of Sevastopol, military operations on the Crimean battlefield gradually decreased. Russian troops entered the heights north of Sevastopol, but Belisier refused the emperor's order and did not counterattack. General Bazin led a part of the French army, at the urging of the emperor, to capture Jinben and cut off Odessa's external transportation routes. By November, Napoleon III was ready to make peace when he saw good, while Britain preferred to continue fighting. The British army was heavily replenished, and in January 1856, Sir Colrington succeeded Simpson as the new commander-in-chief of the British army, and prepared for the spring offensive. At this time, the French army was plagued by illness, and the British army had sufficient logistics and strong troops. The leitmotif of 1856 was the expectation of peace, diplomatic action replaced military planning, and a ceasefire agreement was reached on the Crimean battlefield in February