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The borders of the Roman Empire in southeastern Europe was the River Danube. Part of the border in Western Europe was the River Rhine . These provided a degree of protection. Garrisons were placed along the banks of the rivers. In an area of Germany between these two rivers the Romans built the limes Germanicus, a 568 km (353 miles) long system of fortifications with a series of walls and at least 58 forts and 900 watchtowers (some of them might not have been recovered by archaeologists.

In northern England the Romans built Hadrian's Wall, a wall which was 117.5 km (73 miles) long and run from coast to coast. There were 80 fortlets which could host perhaps 20-30 soldiers (they are called milecastles because they were built at intervals of a Roman mile) which guarded a guarded a gateway through the wall. These were stone watchtowers placed about 1/3 of a Roman mile on ether side of the fortlet. There were 14 to 17 full size forts which could host 500-1,000 troops.

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8y ago

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