Fortification

military constructions and buildings designed for defense in warfare and military bases

10 dated entries naming Fortification, drawn from 10 separate years between 408 CE and 849 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.

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5th century

408The Hexamilion wall is constructed. Fortifications are built across the Isthmus of Corinth, guarding the only land route into the Peloponnese peninsula from Greece.source
490King Theodoric the Great retreats to Ticinum (modern Pavia), where he constructs a fortified camp, which is blockaded.source
497Isaurian War: Anastasius I regains control of the Isauria region (Asia Minor) and has the rebel leaders executed. Anastasius I pacifies the mountain strongholds of the Isaurians, ending the revolt that they began upon his ascension to the throne 6 years ago.source

6th century

505Anastasius I decides to rebuild the village of Dara (Northern Mesopotamia). He constructs a new strategic fortress to guard the frontier.source
547Battle of Marta: The Byzantine army under John Troglita is defeated by Moorish tribes in Tripolitania. He flees to Lunci (9 km south of Mahares), and is forced to withdraw north to the fortress of Laribus (near modern El Kef).source
595The Lombards sack the town of Terracina (Central Italy). After they conquer more cities, Terracina remains an important military stronghold of the Byzantine Empire.source

7th century

611Byzantine–Persian War: The Persian army under Shahrbaraz captures Antioch, and most of the remaining Byzantine fortresses in Syria and Mesopotamia. King Khosrau II is re-establishing a neo-Persian Empire, and intensifies his war effort. The Byzantine army, ruined by defeat and corruption, offers only half-hearted opposition.source

8th century

730September–October – Umayyad forces sack the Byzantine fortress of Charsianon in central Anatolia (modern Turkey), which remains a contested stronghold during the next century of Byzantine–Arab warfare.source
757Battle of Suiyang: A Tang garrison (7,000 men) under Zhang Xun defend their fortress against the rebel army at Suiyang. Zhang makes multiple attempts to get food from nearby fortresses, but this is refused. After a desperate 10-month siege, Suiyang is overrun by rebel forces who take the city. Because of famine an estimated 20,000 to 30,000 citizens are cannibalized, only 400 people are left.source

9th century

849Summer – Battle of Ostia: A Saracen Arab fleet from Sardinia sets sail towards Rome. In response, Pope Leo IV forms a coalition of maritime Italian cities, including Naples, Amalfi and Gaeta, led by Admiral Caesar — which is assembled off the re-fortified port of Ostia — and repels the Saracen marauders. Their navy is scattered, resulting in many sunken vessels. Rome is saved from plunder and the expansion of the Aghlabids.source