Question: Cao Cao recently lost which land that Lui Bei occupied?
About the article "Battle of Red Cliffs", section "Aftermath".

Candidate passages:
By the end of 209, the post Cao Cao had established at Jiangling fell to Zhou Yu.
The borders of the land under Cao Cao's control contracted about , to the area around Xiangyang .
Liu Bei, on the other hand, had gained territory by taking over the four commanderies (Wuling, Changsha, Lingling and Guiyang) south of the Yangtze River.
Sun Quan's troops had suffered far greater casualties than Liu Bei's in the extended conflict against Cao Ren following the Battle of Red Cliffs , and the death of Zhou Yu in 210 resulted in a drastic weakening of Sun Quan's strength in Jing Province .
Liu Bei also occupied Jing Province that Cao Cao had recently lost — a strategic and naturally fortified area on the Yangtze River that Sun Quan claimed for himself.
The control of Jing Province provided Liu Bei with virtually unlimited access to the passage into Yi Province (covering present-day Sichuan and Chongqing) and important waterways into Wu (southeastern China), as well as dominion of the southern Yangtze River.
Never again would Cao Cao command so large a fleet as he had at Jiangling, nor would a similar opportunity to destroy his southern rivals present itself again .
The Battle of Red Cliffs and the capture of Jing Province by Liu Bei confirmed the separation of southern China from the northern heartland of the Yellow River valley, and also foreshadowed a north-south axis of hostility which would resonate for centuries .
Around that time, Liu Bei had recently been defeated by Cao Cao at the Battle of Changban, and he planned to lead his followers south across the Yangtze River.
Liu Bei met Lu Su at Dangyang, where they discussed the formation of an alliance between Liu and Sun Quan.
Liu Bei then moved to Xiakou (夏口; present-day Hankou, Wuhan, Hubei) and garrisoned there, while sending Zhuge Liang to follow Lu Su to meet Sun Quan and affirm the Liu-Sun alliance.
Sun Quan then ordered Zhou Yu and Cheng Pu to lead his forces to join Liu Bei in resisting Cao Cao, and they rendezvoused at Red Cliffs (赤壁).
A plague had broken out in Cao Cao's army, so Cao lost to the allies in an early skirmish between both sides.
Cao Cao then moved his camp to the northern bank of the Yangtze River while the allies remained at the south.
Zhou Yu's subordinate Huang Gai told him, "The enemy are superior in numbers in comparison with our side.
I fear that we cannot last long.
However, I observe that Cao Cao's ships are linked to each other.
We can destroy them by fire."
Huang Gai then prepared about ten "mengchong"s and "doujian"s (鬬艦; a type of warship) and filled them with the ingredients necessary for starting a fire.
He then wrote a letter to Cao Cao, pretending that he wanted to surrender and defect to the latter's side.
Huang Gai then prepared some "zouge"s (走舸; a smaller type of boat), which would follow behind the "mengchong"s and "doujian"s, and his small fleet sailed towards Cao Cao's base.
The wind was blowing strongly from the southeast.
When Huang Gai's fleet reached the middle of the river, the ships all raised their sails, and Huang Gai lifted a torch and instructed his men to shout "We surrender!"
Cao Cao's troops came out of the camp to look and they said Huang Gai was coming to join them.
When Huang Gai was about 20 "li" away from the enemy base, he ordered his men to set the ships on fire and they boarded the smaller boats behind.
As the wind was very strong, the flaming ships sailed towards Cao Cao's warships at fast speed and caused them to catch fire as well.
Cao Cao's ships were all burnt down and the flames also spread quickly to his camps on land.
Zhou Yu then ordered an attack on Cao Cao's base and scored a major victory.
Cao Cao retreated north with his surviving troops after his defeat.
Zhou Yu and Liu Bei led their respective forces in pursuit of Cao Cao, but Cao had already fled. 
Zhang Lu retreated to Bazhong (巴中; in present-day eastern Sichuan) when he heard that Yangping Pass had been taken.
Cao Cao's army occupied Nanzheng (南鄭; present-day Nanzheng County, Hanzhong, Shaanxi), the capital of Hanzhong commandery, and seized the precious items stored in Zhang Lu's treasuries.
The people in Hanzhong surrendered to Cao Cao, who then renamed the place to "Hanzhong" from its previous name "Hanning" (漢寧).
Cao Cao separated Anyang (安陽) and Xicheng (西城) counties from Hanzhong and placed them under the jurisdiction of Xicheng commandery (西城郡) and appointed an Administrator (太守) to oversee the commandery.
He also partitioned Xi (錫) and Shangyong commandery (上庸郡) and appointed Commandants (都尉) to govern those areas.
In the ninth month, the tribal king Pu Hu (朴胡) and Du Huo (杜濩), the Marquis of Congyi (賨邑侯), led the people in Bayi (巴夷) and Cong (賨) to submit to Cao Cao.
Cao Cao split Ba commandery (巴郡) into Badong (巴東; "East Ba") and Baxi (巴西; "West Ba") commanderies and appointed Pu Hu and Du Huo, who also received marquis titles, as their Administrators respectively.
Emperor Xian also granted Cao Cao the authority to confer titles upon the nobles and officials in the area.
In the 11th month, Zhang Lu led his followers out of Bazhong and came to surrender to Cao Cao.
Cao Cao accepted their surrender and granted marquis titles to Zhang Lu and his five sons.
Around the time, Liu Bei had recently seized control of Yi Province (益州; covering present-day Sichuan and Chongqing) from its governor Liu Zhang and occupied Bazhong after Zhang Lu left.
Cao Cao ordered Zhang He to lead a force to attack Liu Bei, but Zhang He lost to Liu's general Zhang Fei at the Battle of Baxi.
In the 12th month, Cao Cao left Nanzheng and headed back to Ye (鄴; in present-day Handan, Hebei), leaving behind Xiahou Yuan to guard Hanzhong. 
By 199, Cao Cao had Emperor Xian in his control and enjoyed a political advantage.
Liu Bei joined a conspiracy headed by Dong Cheng, an imperial relative, and some others to remove Cao Cao from power.
Moreover, he was anxious to leave Cao Cao's stronghold, Xuchang.
Hence, on hearing that Yuan Shu had surrendered to, and was on his way, via Xiapi, to join Yuan Shao in the north, Liu Bei asked to lead an army to intercept Yuan Shu.
Before his advisers were able to change his mind, Cao Cao consented, commissioned Liu Bei and Zhu Ling with an army to move south.
Having his path blocked, Yuan Shu turned back to Shouchun and died there later.
Zhu Ling returned to Xuchang, but Liu stayed behind with the army.
Liu Bei seized the opportunity to kill Che Zhou, the Governor of Xu Province who was appointed by the imperial court after Lü Bu's defeat.
Liu Bei took over Xu Province and left Guan Yu behind to guard Xiapi while he stationed himself in Xiaopei.
Yuan Shao, who earlier recognised Liu Bei's control on Xu Province, had defeated Gongsun Zan, and started moving against Cao Cao on the northern bank of the Yellow River.
Knowing that he still had a plenty of spies and cohort inside the imperial capital, Liu Bei sent his messenger, Sun Qian, to Yuan Shao to request an immediate attack be launched against Cao Cao.
However, Yuan Shao turned down Liu Bei's plea, even though his own strategists advised him to do Liu a favour.
In 200, Dong Cheng's plot was discovered.
All conspirators and their families were summarily executed.
However, Liu Bei, as well as a few others who were outside Cao Cao's domain, survived the purge.
With his domestic situation settled, Cao Cao turned his attention to his last great rival in the north, Yuan Shao.
Cao fortified many of the key crossing points on the Yellow River which divided his territory from Yuan's; he personally made camp at Guandu with his main army.
To eliminate Yuan Shao's last southern ally, Cao sent his subordinates, Liu Dai and Wang Zhong against Liu Bei, but they were defeated.
Predicting that Yuan Shao would be hesitant to go on the offensive, Cao Cao led his army away from Guandu to personally overrun Liu Bei's position.
He overcame Liu Bei in an extremely short period of time, leaving Yuan Shao no chance to aid Liu on second thought.
Yuan Shao's attempt to reinforce Liu was repulsed by Yu Jin, whom Cao Cao had left in command of his troops at Yan Ford.
Liu Bei's force disintegrated under the weight of Cao Cao's assault, but his trusted aides all survived the war.
Zhang Fei protected Liu Bei when the latter fled from the battlefield, while Guan Yu surrendered to Cao Cao on terms that he could return to Liu Bei's service if the latter was alive.
Liu Bei fled north to join Yuan Shao, where he was received with respect by Yuan Shao and his son Yuan Tan.
Liu Bei participated in the unsuccessful battles along the Yellow River, in which Yuan Shao successively lost two of his best generals Yan Liang and Wen Chou, with the former being slain by Guan Yu.
As Liu Pi in Runan rebelled against Cao Cao, Liu Bei persuaded Yuan Shao to "lend" him an army to help Liu Pi.
Liu Bei and Liu Pi attacked Xuchang but were defeated by Cao Ren.
Liu Bei returned to the north and urged Yuan Shao to ally with Liu Biao, governor of Jing Province (present-day Hubei and Hunan).
Yuan Shao again sent him with an army to Runan to aid the bandit leader, Gong Du.
They were able to kill Cao Cao's general Cai Yang there. 
Cao Cao's intro is very similar to Liu Bei's, but obviously focuses more on his point of view.
It is almost immediately established for him that he has the Mandate of Heaven, and dives into the personality of some Wei officers, not to mention the details of Diao Chan's time in captivity.
Cao Cao begins with trusted officers like Xun Yu and Xiahou Yuan.
However, he is also noted to be battling Yuan Shao at the same time as dealing with Liu Bei, thus explaining why some of his stronger officers come in later.
Cao Cao also develops a bond with Diao Chan, which annoys the sorceress Himiko to no end.
As Himiko secretly held romantic feelings for Cao Cao, she'd often take out her frustrations on Diao Chan which would just anger Cao Cao even further.
Cao Cao manages to constantly quell Liu Bei's efforts to defeat him, but soon finds trouble when Zhuge Liang enters the scene.
Cao Ren, Cao Cao's cousin, is nearly killed; Xiahou Yuan, Cao Cao's best officer, is slain in an ambush; and finally Cao Cao himself is nearly beheaded in battle against the sorcerer if not for Himiko's intervention.
Liu Bei later allies himself with Sun Quan for the Battle of Chi Bi, but Cao Cao manages to overcome them despite a brilliant fire tactic, proving the power of the Mandate of Heaven.
Following Chi Bi Cao Cao is forced to let Liu Bei and Sun Quan recover as Ma Chao launched an attack on the capital.
While this was going on Liu Bei managed to create the territory of Shu.
In response Cao Cao dethroned the Han Emperor and created Wei.
Xun Yu also became jealous of Diao Chan, as she too was in love with Cao Cao, but reluctantly agreed to serve him as a warrior rather than a woman.
As Cao Cao continued to win battles against Liu Bei, his uncle, in fear of what the ultimate result would be, revealed that Cao Cao and Liu Bei were brothers by means of the same mother.
This explained as to why Diao Chan knew a tune Cao Cao remembered his mother singing from time to time.
In spite of this new information Cao Cao captured Liu Bei's capital and subjugated Wu.
However Liu Bei and his officers escaped and vanished.
Not long later Cao Cao learnt that Liu Bei was leading a large rebellion in his former province of Xu.
During the final battle, Himiko went into a jealous rage and tried to destroy everyone, but Cao Cao and Xun Yu were able to pacify her.
Following his final victory at the "Battle of Chang Zheng", Zhuge Liang raises a rebellion with what remains of the Wu and Shu armies.
Cao Cao and his army defeat Zhuge Liang.
After this, one sees that Diao Chan and Liu Bei were reunited.